diff --git a/Week04/decorators_ridvan_celebi.py b/Week04/decorators_ridvan_celebi.py
new file mode 100644
index 00000000..0cc68707
--- /dev/null
+++ b/Week04/decorators_ridvan_celebi.py
@@ -0,0 +1,20 @@
+import time
+import tracemalloc
+
+def performance(fn):
+    def _performance(*args, **kwargs):
+        if(not hasattr(performance,"counter")):
+            setattr(performance,"counter",0)
+            setattr(performance,"total_time",0)
+            setattr(performance,"mem",0)
+        performance.counter += 1
+        tracemalloc.start()
+        start_time = time.time()
+        result = fn(*args, **kwargs)
+        end_time = time.time()
+        current,peak = tracemalloc.get_traced_memory()
+        tracemalloc.stop()
+        performance.total_mem = peak
+        performance.total_time += end_time-start_time
+        return result
+    return _performance