diff --git a/Week04/decorators_elif_yalvac.py b/Week04/decorators_elif_yalvac.py
new file mode 100644
index 00000000..9af6ee36
--- /dev/null
+++ b/Week04/decorators_elif_yalvac.py
@@ -0,0 +1,29 @@
+import time
+import tracemalloc
+
+def performance(func):
+    def wrapper(*args, **kwargs):
+        if not hasattr(performance, "counter"):
+            performance.counter = 0
+            performance.total_time = 0
+            performance.total_mem = 0
+        # Sayaç artır
+        performance.counter += 1
+        # Bellek ölçümü başlat
+        tracemalloc.start()
+        # Zaman ölçümü başlat
+        start_time = time.perf_counter()
+        # Fonksiyonu çalıştır
+        result = func(*args, **kwargs)
+        # Zaman ölçümü bitir
+        end_time = time.perf_counter()
+        # Bellek ölçümü al
+        current, peak = tracemalloc.get_traced_memory()
+        tracemalloc.stop()
+        # Toplamları güncelle
+        performance.total_time += (end_time - start_time)
+        performance.total_mem += peak
+        return result
+    wrapper.__name__ = func.__name__
+    wrapper.__doc__ = func.__doc__
+    return wrapper