diff --git a/task01/src/com/example/task01/Level.java b/task01/src/com/example/task01/Level.java
new file mode 100644
index 00000000..ca6f18ba
--- /dev/null
+++ b/task01/src/com/example/task01/Level.java
@@ -0,0 +1,8 @@
+package com.example.task01;
+
+public enum Level {
+    DEBUG,
+    INFO,
+    WARNING,
+    ERROR
+}
diff --git a/task01/src/com/example/task01/Logger.java b/task01/src/com/example/task01/Logger.java
new file mode 100644
index 00000000..15580c2c
--- /dev/null
+++ b/task01/src/com/example/task01/Logger.java
@@ -0,0 +1,73 @@
+package com.example.task01;
+
+import java.text.SimpleDateFormat;
+import java.util.ArrayList;
+import java.util.Date;
+
+public class Logger {
+    private String name;
+    private Level level;
+    private static ArrayList<Logger> loggers = new ArrayList<Logger>();
+    public Logger(String name) {
+        this.name = name;
+    }
+    public String getName(){
+        return name;
+    }
+    public static Logger getLogger(String name){
+        for (int i= 0; i< loggers.size();i++){
+            if(loggers.get(i).getName().equals(name)){
+                return loggers.get(i);
+            }
+        }
+        Logger logger = new Logger(name);
+        loggers.add(logger);
+        return logger;
+    }
+    public void setLevel(Level level) {
+        this.level = level;
+    }
+    public Level getLevel() {
+        return level;
+    }
+    private String formatMessage(Level level, String Message){
+        String date = new SimpleDateFormat("dd/MM/yyyy HH:mm:ss").format(new Date());
+
+        return String.format("[%s] %s  %s - %s", level.name(), date, this.name, Message);
+    }
+    public void log(Level level, String message){
+
+        if(level.compareTo(this.level) >= 0){
+            System.out.println(formatMessage(level, message));
+        }
+    }
+    public void log(Level level, String format, Object... args){
+        if(level.compareTo(this.level) >= 0){
+            System.out.println(formatMessage(level, String.format(format, args)));
+        }
+    }
+    public void debug(String message){
+        log(Level.DEBUG, message);
+    }
+    public void debug(String format, Object... args){
+        log(Level.DEBUG,format,args);
+    }
+    public void info(String message){
+        log(Level.INFO, message);
+    }
+    public void info(String format, Object... args){
+        log(Level.INFO, format, args);
+    }
+    public void warning(String message){
+        log(Level.WARNING, message);
+    }
+    public void warning(String format, Object... args){
+        log(Level.WARNING, format, args);
+    }
+    public void error(String message){
+        log(Level.ERROR, message);
+    }
+    public void error(String format, Object... args){
+        log(Level.ERROR, format, args);
+    }
+}
diff --git a/task01/src/com/example/task01/Task01Main.java b/task01/src/com/example/task01/Task01Main.java
index 9973557d..4313cbbc 100644
--- a/task01/src/com/example/task01/Task01Main.java
+++ b/task01/src/com/example/task01/Task01Main.java
@@ -2,6 +2,6 @@
 
 public class Task01Main {
     public static void main(String[] args) {
-
+        return;
     }
 }
diff --git a/task02/src/com/example/task02/DiscountBill.java b/task02/src/com/example/task02/DiscountBill.java
new file mode 100644
index 00000000..8e429d02
--- /dev/null
+++ b/task02/src/com/example/task02/DiscountBill.java
@@ -0,0 +1,18 @@
+package com.example.task02;
+
+public class DiscountBill extends Bill{
+    private final double discount;
+    public DiscountBill(int discount) {
+        this.discount = discount;
+    }
+    public String getDiscount() {
+        return discount + "%";
+    }
+    public long getAbsoluteDiscount(){
+        return (long)(super.getPrice() * ((double)discount / 100));
+    }
+    @Override
+    public long getPrice() {
+        return super.getPrice() - getAbsoluteDiscount();
+    }
+}
diff --git a/task02/src/com/example/task02/Task02Main.java b/task02/src/com/example/task02/Task02Main.java
index e589f2d3..6cfca1db 100644
--- a/task02/src/com/example/task02/Task02Main.java
+++ b/task02/src/com/example/task02/Task02Main.java
@@ -2,12 +2,12 @@
 
 public class Task02Main {
 
-    private static final Item ITEM1 = new Item("Товар 1", 10);
-    private static final Item ITEM2 = new Item("Товар 2", 20);
-    private static final Item ITEM3 = new Item("Товар 3", 30);
-    private static final Item ITEM4 = new Item("Товар 4", 40);
-    private static final Item ITEM5 = new Item("Товар 5", 50);
-    private static final Item ITEM6 = new Item("Товар 6", 60);
+    private static final Item ITEM1 = new Item("Item 1", 10);
+    private static final Item ITEM2 = new Item("Item 2", 20);
+    private static final Item ITEM3 = new Item("Item 3", 30);
+    private static final Item ITEM4 = new Item("Item 4", 40);
+    private static final Item ITEM5 = new Item("Item 5", 50);
+    private static final Item ITEM6 = new Item("Item 6", 60);
 
     public static void main(String[] args) {
         Bill bill = new Bill();
diff --git a/task03/src/com/example/task03/Hours.java b/task03/src/com/example/task03/Hours.java
new file mode 100644
index 00000000..6b8ff907
--- /dev/null
+++ b/task03/src/com/example/task03/Hours.java
@@ -0,0 +1,29 @@
+package com.example.task03;
+
+public class Hours implements TimeUnit{
+    private final long amount;
+
+    public Hours(long amount) {
+        this.amount = amount;
+    }
+
+    @Override
+    public long toMinutes() {
+        return amount * 60;
+    }
+
+    @Override
+    public long toSeconds() {
+        return amount * 3600;
+    }
+
+    @Override
+    public long toMillis() {
+        return amount * 3600000;
+    }
+
+    @Override
+    public long toHours() {
+        return amount;
+    }
+}
diff --git a/task03/src/com/example/task03/Milliseconds.java b/task03/src/com/example/task03/Milliseconds.java
index 5115bc7d..bfbb5132 100644
--- a/task03/src/com/example/task03/Milliseconds.java
+++ b/task03/src/com/example/task03/Milliseconds.java
@@ -23,6 +23,11 @@ public long toSeconds() {
 
     @Override
     public long toMinutes() {
-        return amount / 1000 * 60;
+        return amount / 60000;
+    }
+
+    @Override
+    public long toHours() {
+        return amount / 3600000;
     }
 }
diff --git a/task03/src/com/example/task03/Minutes.java b/task03/src/com/example/task03/Minutes.java
index d6fa0594..67c9744b 100644
--- a/task03/src/com/example/task03/Minutes.java
+++ b/task03/src/com/example/task03/Minutes.java
@@ -1,27 +1,32 @@
 package com.example.task03;
 
 public class Minutes implements TimeUnit {
+    private final long amount;
 
     public Minutes(long amount) {
-        // TODO: реализовать
-        throw new UnsupportedOperationException();
+        this.amount = amount;
     }
 
     @Override
     public long toMillis() {
         // TODO: реализовать
-        throw new UnsupportedOperationException();
+        return amount * 60 * 1000;
     }
 
     @Override
     public long toSeconds() {
         // TODO: реализовать
-        throw new UnsupportedOperationException();
+        return amount * 60;
     }
 
     @Override
     public long toMinutes() {
         // TODO: реализовать
-        throw new UnsupportedOperationException();
+        return amount;
+    }
+
+    @Override
+    public long toHours() {
+        return amount / 60;
     }
 }
diff --git a/task03/src/com/example/task03/Seconds.java b/task03/src/com/example/task03/Seconds.java
index ce6bc213..7814ee3a 100644
--- a/task03/src/com/example/task03/Seconds.java
+++ b/task03/src/com/example/task03/Seconds.java
@@ -25,4 +25,9 @@ public long toSeconds() {
     public long toMinutes() {
         return Math.round(amount / 60);
     }
+
+    @Override
+    public long toHours() {
+        return amount / 3600;
+    }
 }
diff --git a/task03/src/com/example/task03/TimeUnit.java b/task03/src/com/example/task03/TimeUnit.java
index 3b123fb8..303a88b4 100644
--- a/task03/src/com/example/task03/TimeUnit.java
+++ b/task03/src/com/example/task03/TimeUnit.java
@@ -28,4 +28,6 @@ public interface TimeUnit {
      */
     long toMinutes();
 
+    long toHours();
+
 }
diff --git a/task03/src/com/example/task03/TimeUnitUtils.java b/task03/src/com/example/task03/TimeUnitUtils.java
index 790f8850..a32efec7 100644
--- a/task03/src/com/example/task03/TimeUnitUtils.java
+++ b/task03/src/com/example/task03/TimeUnitUtils.java
@@ -24,4 +24,6 @@ public static Milliseconds toMillis(Seconds seconds) {
     public static Seconds toSeconds(Milliseconds millis) {
         return new Seconds(millis.toSeconds());
     }
+    public static Minutes toMinutes(Seconds seconds){return new Minutes(seconds.toMinutes());}
+    public static Hours toHours(Minutes minutes){return new Hours(minutes.toHours());}
 }
diff --git a/task04/src/com/example/task04/ConsoleHandler.java b/task04/src/com/example/task04/ConsoleHandler.java
new file mode 100644
index 00000000..65705178
--- /dev/null
+++ b/task04/src/com/example/task04/ConsoleHandler.java
@@ -0,0 +1,9 @@
+package com.example.task04;
+
+public class ConsoleHandler implements MessageHandler{
+
+    @Override
+    public void Handle(String message) {
+        System.out.println(message);
+    }
+}
diff --git a/task04/src/com/example/task04/FileHandler.java b/task04/src/com/example/task04/FileHandler.java
new file mode 100644
index 00000000..100c69a9
--- /dev/null
+++ b/task04/src/com/example/task04/FileHandler.java
@@ -0,0 +1,33 @@
+package com.example.task04;
+import javax.imageio.IIOException;
+import java.io.*;
+public class FileHandler implements MessageHandler{
+    private String fileName;
+    public FileHandler(){}
+    public FileHandler(String fileName){
+        this.fileName = fileName;
+    }
+    @Override
+    public void Handle(String message) {
+        try {
+            PrintWriter pw = new PrintWriter( new FileWriter(fileInit(fileName),true) );
+            pw.println(message);
+            pw.close();
+        } catch (FileNotFoundException e) {
+            throw new RuntimeException(e);
+        } catch (IOException e) {
+            throw new RuntimeException(e);
+        }
+    }
+    private File fileInit(String fileName){
+        File file = new File(String.format("task04/%s.txt",fileName));
+        if(!file.exists()){
+            try {
+                file.createNewFile();
+            } catch (IOException e) {
+                throw new RuntimeException(e);
+            }
+        }
+        return file;
+    }
+}
diff --git a/task04/src/com/example/task04/HandleEnum.java b/task04/src/com/example/task04/HandleEnum.java
new file mode 100644
index 00000000..0d25d299
--- /dev/null
+++ b/task04/src/com/example/task04/HandleEnum.java
@@ -0,0 +1,15 @@
+package com.example.task04;
+import java.time.temporal.ChronoUnit;
+public enum HandleEnum {
+    ConsoleHandle(new ConsoleHandler()),
+    FileHandle(new FileHandler()),
+    RotationFileHandle(new RotationFileHandler(ChronoUnit.SECONDS)),
+    MemoryHandle(new MemoryHandler());
+    private final MessageHandler messageHandler;
+    HandleEnum(MessageHandler messageHandler) {
+        this.messageHandler = messageHandler;
+    }
+    public MessageHandler getHandle(){
+        return  this.messageHandler;
+    }
+}
diff --git a/task04/src/com/example/task04/Level.java b/task04/src/com/example/task04/Level.java
new file mode 100644
index 00000000..277816f3
--- /dev/null
+++ b/task04/src/com/example/task04/Level.java
@@ -0,0 +1,8 @@
+package com.example.task04;
+
+public enum Level {
+    DEBUG,
+    INFO,
+    WARNING,
+    ERROR
+}
diff --git a/task04/src/com/example/task04/Logger.java b/task04/src/com/example/task04/Logger.java
new file mode 100644
index 00000000..f911980d
--- /dev/null
+++ b/task04/src/com/example/task04/Logger.java
@@ -0,0 +1,75 @@
+package com.example.task04;
+
+import java.text.SimpleDateFormat;
+import java.util.ArrayList;
+import java.util.Date;
+
+public class Logger {
+    private String name;
+    private Level level;
+    private MessageHandler messageHandler;
+    private static ArrayList<Logger> loggers = new ArrayList<Logger>();
+    public Logger(String name,  HandleEnum handleType) {
+        this.name = name;
+        messageHandler = handleType.getHandle();
+    }
+    public String getName(){
+        return name;
+    }
+    public static Logger getLogger(String name){
+        for (int i= 0; i< loggers.size();i++){
+            if(loggers.get(i).getName().equals(name)){
+                return loggers.get(i);
+            }
+        }
+        Logger logger = new Logger(name);
+        loggers.add(logger);
+        return logger;
+    }
+    public void setLevel(Level level) {
+        this.level = level;
+    }
+    public Level getLevel() {
+        return level;
+    }
+    private String formatMessage(Level level, String Message){
+        String date = new SimpleDateFormat("dd/MM/yyyy HH:mm:ss").format(new Date());
+
+        return String.format("[%s] %s  %s - %s", level.name(), date, this.name, Message);
+    }
+    public void log(Level level, String message){
+
+        if(level.compareTo(this.level) >= 0){
+            messageHandler.Handle(formatMessage(level, message));
+        }
+    }
+    public void log(Level level, String format, Object... args){
+        if(level.compareTo(this.level) >= 0){
+            messageHandler.Handle(formatMessage(level, String.format(format, args)));
+        }
+    }
+    public void debug(String message){
+        log(Level.DEBUG, message);
+    }
+    public void debug(String format, Object... args){
+        log(Level.DEBUG,format,args);
+    }
+    public void info(String message){
+        log(Level.INFO, message);
+    }
+    public void info(String format, Object... args){
+        log(Level.INFO, format, args);
+    }
+    public void warning(String message){
+        log(Level.WARNING, message);
+    }
+    public void warning(String format, Object... args){
+        log(Level.WARNING, format, args);
+    }
+    public void error(String message){
+        log(Level.ERROR, message);
+    }
+    public void error(String format, Object... args){
+        log(Level.ERROR, format, args);
+    }
+}
diff --git a/task04/src/com/example/task04/MemoryHandler.java b/task04/src/com/example/task04/MemoryHandler.java
new file mode 100644
index 00000000..a18d0615
--- /dev/null
+++ b/task04/src/com/example/task04/MemoryHandler.java
@@ -0,0 +1,20 @@
+package com.example.task04;
+
+import java.util.ArrayList;
+
+public class MemoryHandler implements MessageHandler{
+    private ArrayList<String> memory = new ArrayList<>();
+    private int limit = 50;
+    private ConsoleHandler handler = new ConsoleHandler();
+    @Override
+    public void Handle(String message) {
+        if (memory.size() < limit){
+            memory.add(message);
+        }else {
+            for (String element : memory){
+                handler.Handle(element);
+            }
+            memory.clear();
+        }
+    }
+}
diff --git a/task04/src/com/example/task04/MessageHandler.java b/task04/src/com/example/task04/MessageHandler.java
new file mode 100644
index 00000000..8a9b08be
--- /dev/null
+++ b/task04/src/com/example/task04/MessageHandler.java
@@ -0,0 +1,5 @@
+package com.example.task04;
+
+public interface MessageHandler {
+    void Handle(String message);
+}
diff --git a/task04/src/com/example/task04/RotationFileHandler.java b/task04/src/com/example/task04/RotationFileHandler.java
new file mode 100644
index 00000000..1cabf193
--- /dev/null
+++ b/task04/src/com/example/task04/RotationFileHandler.java
@@ -0,0 +1,24 @@
+package com.example.task04;
+
+import java.text.SimpleDateFormat;
+import java.time.LocalDateTime;
+import java.time.temporal.ChronoUnit;
+import java.util.Date;
+
+public class RotationFileHandler implements MessageHandler{
+    private ChronoUnit rotation;
+    private LocalDateTime previousRotation;
+    private FileHandler fileHandler;
+    public RotationFileHandler(ChronoUnit rotation) {
+        this.previousRotation = LocalDateTime.now();
+        this.rotation = rotation;
+    }
+    @Override
+    public void Handle(String message) {
+        if(LocalDateTime.now().isAfter(previousRotation.plus(3,rotation)) ) {
+            fileHandler = new FileHandler( new SimpleDateFormat("HH-mm-ss").format(new Date()));
+            fileHandler.Handle(message);
+            previousRotation = LocalDateTime.now();
+        }
+    }
+}