diff --git a/sem1/test3/test3.1/list.cpp b/sem1/test3/test3.1/list.cpp
new file mode 100644
index 0000000..cad92f8
--- /dev/null
+++ b/sem1/test3/test3.1/list.cpp
@@ -0,0 +1,71 @@
+#include <iostream>
+#include "list.h"
+using namespace std;
+
+struct ListElement
+{
+    int number;
+    int amount;
+    ListElement *next;
+};
+
+struct List
+{
+    ListElement *first;
+};
+
+List *createList()
+{
+    return new List {nullptr};
+}
+
+void putOnPlace(ListElement *&element, int number)
+{
+    if (element->next && element->number > element->next->number)
+    {
+        ListElement *current = element->next;
+        element->next = element->next->next;
+        current->next = element;
+        element = current;
+        putOnPlace(element->next, number);
+    }
+}
+
+void addElement(List *list, int number)
+{
+    ListElement *current = list->first;
+    while (current)
+    {
+        if (current->number == number)
+        {
+            current->amount++;
+            return;
+        }
+        current = current->next;
+    }
+    ListElement *newElement = new ListElement {number, 1, list->first};
+    list->first = newElement;
+    putOnPlace(list->first, number);
+}
+
+void deleteList(List *list)
+{
+    while (list->first)
+    {
+        ListElement *current = list->first;
+        list->first = current->next;
+        delete current;
+    }
+    delete list;
+}
+
+void displayList(List *list)
+{
+    ListElement *current = list->first;
+    while (current)
+    {
+        cout << current->number << "=>" << current->amount << " ";
+        current = current->next;
+    }
+}
+
diff --git a/sem1/test3/test3.1/list.h b/sem1/test3/test3.1/list.h
new file mode 100644
index 0000000..27e9549
--- /dev/null
+++ b/sem1/test3/test3.1/list.h
@@ -0,0 +1,10 @@
+#pragma once
+
+struct ListElement;
+struct List;
+
+List *createList();
+void deleteList(List *list);
+
+void addElement(List *list, int number);
+void displayList(List *list);
diff --git a/sem1/test3/test3.1/main.cpp b/sem1/test3/test3.1/main.cpp
new file mode 100644
index 0000000..abce0c4
--- /dev/null
+++ b/sem1/test3/test3.1/main.cpp
@@ -0,0 +1,20 @@
+#include <iostream>
+#include "list.h"
+using namespace std;
+
+int main()
+{
+    List *list = createList();
+    cout << "Enter numbers:" << endl;
+    int number = 0;
+    cin >> number;
+    for (int i = 0; number != 0; i++)
+    {
+        addElement(list, number);
+        cin >> number;
+    }
+    cout << endl;
+    displayList(list);
+    deleteList(list);
+}
+