diff --git a/src/main/java/utils2/Math2.java b/src/main/java/utils2/Math2.java
new file mode 100644
index 0000000..86d23cb
--- /dev/null
+++ b/src/main/java/utils2/Math2.java
@@ -0,0 +1,10 @@
+package utils2;
+
+public class Math2 {
+
+    Integer summary(Integer n) {
+        if(n < 10) return 1;
+        if(n > 10 && n < 20) return 2;
+        return n;
+    }
+}
diff --git a/src/test/java/utils2/TC_1_Math2.java b/src/test/java/utils2/TC_1_Math2.java
new file mode 100644
index 0000000..dd30475
--- /dev/null
+++ b/src/test/java/utils2/TC_1_Math2.java
@@ -0,0 +1,17 @@
+package utils2;
+
+import org.junit.Test;
+
+import java.util.Optional;
+
+import static junit.framework.TestCase.assertEquals;
+
+public class TC_1_Math2 {
+
+    @Test
+    public void shouldSubtractIfMagicNumber() {
+        Math2 m = new Math2();
+        ;
+        assertEquals(Optional.of(1), m.summary(5));
+    }
+}