diff --git a/Main.class b/Main.class
index dcd9730c20e9ee096cf0fbe34568807d2e018ad2..da85ca671b58a8b0d2324477bfc51d6c54f75210 100644
Binary files a/Main.class and b/Main.class differ
diff --git a/Main.java b/Main.java
index 544b8a225e3d136c09a425fcba965e8fb23aefa5..5f2254d56a9ecf37a00b0a256417566dcf5d70da 100644
--- a/Main.java
+++ b/Main.java
@@ -1,5 +1,9 @@
-class Main {
-  public static void main(String[] args) {
-    System.out.println("Hello world!");
-  }
+public class Main {
+    public static int factorial(int n) {
+        return n <= 1 ? 1 : n * factorial(n - 1);
+    }
+    public static void main(String[] args) {
+        int num = 10;
+        System.out.println(num + "! = " + factorial(num));
+    }
 }