diff --git a/Week04/decorators_esra_kaya.py b/Week04/decorators_esra_kaya.py
new file mode 100644
index 00000000..efb60734
--- /dev/null
+++ b/Week04/decorators_esra_kaya.py
@@ -0,0 +1,26 @@
+import time
+import sys
+
+def performance(func):
+
+    if not hasattr(performance, 'counter'):
+        setattr(performance, 'counter', 0)
+
+    if not hasattr(performance, 'total_time'):
+        setattr(performance, 'total_time', 0.0)
+    
+    if not hasattr(performance, 'total_mem'):
+        setattr(performance, 'total_mem', 0)
+
+    def wrapper(*args, **kwargs):
+        start_time = time.time()       
+        memory_usage=sys.getsizeof(func(*args, **kwargs))
+        end_time = time.time()             
+            
+        setattr(performance, 'counter', getattr(performance, 'counter') + 1)
+        setattr(performance, 'total_time', getattr(performance, 'total_time') + (end_time - start_time))
+        setattr(performance, 'total_mem', getattr(performance, 'total_mem') + memory_usage)
+        
+        return func(*args, **kwargs)
+
+    return wrapper