diff --git a/task4/screenshot.png b/task4/screenshot.png
new file mode 100644
index 0000000..0ebf9d4
Binary files /dev/null and b/task4/screenshot.png differ
diff --git a/task4/src/main/java/TaskRunner.java b/task4/src/main/java/TaskRunner.java
index b6963d7..6b0905b 100644
--- a/task4/src/main/java/TaskRunner.java
+++ b/task4/src/main/java/TaskRunner.java
@@ -28,7 +28,21 @@ public TaskRunner(Object mutex, String msg, int cnt) {
 
     @Override
     public void run() {
-        //TODO sleep 500
+        synchronized (mutex) {
+            while (iter < 100) {
+                if ((iter % 3) == cnt) {
+                    list.add(message);
+                    iter++;
+                    mutex.notifyAll();
+                } else {
+                    try {
+                        mutex.wait();
+                    } catch (InterruptedException e) {
+                        e.printStackTrace();
+                    }
+                }
+            }
+        }
     }
 
 }