diff --git a/Week04/decorators_mehmet_ensar_dolgun.py b/Week04/decorators_mehmet_ensar_dolgun.py
new file mode 100644
index 00000000..e45dacca
--- /dev/null
+++ b/Week04/decorators_mehmet_ensar_dolgun.py
@@ -0,0 +1,26 @@
+import time
+import tracemalloc
+
+def performance(func):
+    
+    performance.counter = 0
+    performance.total_time = 0
+    performance.total_mem = 0
+    
+    def init(*args, **kwargs):
+        start_time = time.time()
+        tracemalloc.start()
+        
+        res = func(*args, **kwargs)
+        
+        current, peak = tracemalloc.get_traced_memory()
+        tracemalloc.stop()
+        end_time = time.time()
+        
+        performance.total_time += end_time - start_time
+        performance.counter += 1
+        performance.total_mem += peak
+        
+        return res 
+    
+    return init