diff --git a/Week04/decorators_buse_demirbas.py b/Week04/decorators_buse_demirbas.py
new file mode 100644
index 00000000..4af2814d
--- /dev/null
+++ b/Week04/decorators_buse_demirbas.py
@@ -0,0 +1,20 @@
+import time
+import tracemalloc
+ 
+ 
+def performance(func):
+    def wrapper(*args, **kwargs):
+        tracemalloc.start()
+        t0 = time.time()
+        result = func(*args, **kwargs)
+        performance.total_time += time.time() - t0
+        performance.total_mem += tracemalloc.get_traced_memory()[1]
+        tracemalloc.stop()
+        performance.counter += 1
+        return result
+    return wrapper
+ 
+performance.counter = 0
+performance.total_time = 0
+performance.total_mem = 0
+