diff --git a/Week04/decorators_serifburak_kalkan.py b/Week04/decorators_serifburak_kalkan.py
new file mode 100644
index 00000000..186d4243
--- /dev/null
+++ b/Week04/decorators_serifburak_kalkan.py
@@ -0,0 +1,26 @@
+import time
+import tracemalloc
+
+def performance(func):
+    setattr(performance, 'counter', 0)
+    setattr(performance, 'total_time', 0)
+    setattr(performance, 'total_mem', 0)
+
+    def wrapper(*args, **kwargs):
+        setattr(performance, 'counter', performance.counter + 1)
+
+        start_time = time.time()
+        tracemalloc.start()
+        start_mem = tracemalloc.get_traced_memory()[1]
+        result = func(*args, **kwargs)
+
+        end_time = time.time()
+        end_mem = tracemalloc.get_traced_memory()[1]
+        tracemalloc.stop()
+
+        setattr(performance, 'total_time', performance.total_time + (end_time - start_time))
+        setattr(performance, 'total_mem', performance.total_mem + (end_mem - start_mem))
+
+        return result
+
+    return wrapper