diff --git a/lib/main.dart b/lib/main.dart
index 8229e03..c50b80d 100644
--- a/lib/main.dart
+++ b/lib/main.dart
@@ -1,3 +1,5 @@
+import 'dart:math';
+
 import 'package:flutter/material.dart';
 
 void main() => runApp(
@@ -26,14 +28,18 @@ class Ball extends StatefulWidget {
 }
 
 class _BallState extends State<Ball> {
+  int ballNumber = 1;
+
   @override
   Widget build(BuildContext context) {
     return Container(
       child: Center(
         child: FlatButton(
-          child: Image.asset('images/ball1.png'),
+          child: Image.asset('images/ball$ballNumber.png'),
           onPressed: () {
-            print('I got clicked');
+            setState(() {
+              ballNumber = Random().nextInt(5) + 1;
+            });
           },
         ),
       ),