diff --git a/Week04/decorators_rukiye_ilhan.py b/Week04/decorators_rukiye_ilhan.py
new file mode 100644
index 00000000..c7603b77
--- /dev/null
+++ b/Week04/decorators_rukiye_ilhan.py
@@ -0,0 +1,22 @@
+import tracemalloc
+import time
+
+
+def performance(func):
+    if not hasattr(performance,'counter'):
+        performance.counter = 0
+        performance.total_time = 0
+        performance.total_mem = 0
+
+    def perform(*args,**kwargs):
+        tracemalloc.start()  # start to follow memory
+        start_time = time.time()
+        result = func(*args, **kwargs)
+        end_time = time.time()
+        used_memory = tracemalloc.get_traced_memory()[1]  # [0] gives current memory consumption but [1] gives total(max) memory consumption during thr last fallowing time
+        tracemalloc.stop()  # we started memeory following process only to find how much memory uses by thr called function not the entire program ,so we stop memory following when the jop of function is finished
+        performance.counter += 1
+        performance.total_time += end_time - start_time
+        performance.total_mem += used_memory
+        return result
+    return perform