diff --git a/Week04/decorators_dilek_celebi.py b/Week04/decorators_dilek_celebi.py
new file mode 100644
index 00000000..4d4d3c13
--- /dev/null
+++ b/Week04/decorators_dilek_celebi.py
@@ -0,0 +1,33 @@
+from time import time
+from sys import getsizeof
+from functools import wraps
+
+def performance(fn):
+    """
+    A decorator to measure the performance of a function.
+    It tracks the number of calls, total execution time, and memory usage of the function.
+    """
+
+    # Initialize performance tracking variables
+    performance.counter = 0
+    performance.total_time = 0.0
+    performance.total_mem = 0
+
+    @wraps(fn)
+    def calculate_perf(*args, **kwargs):
+        # Measure execution time
+        begin_time = time()
+        result = fn(*args, **kwargs)
+        end_time = time()
+
+        # Measure memory usage
+        memory_usage = getsizeof(result)
+
+        # Update performance metrics
+        performance.counter += 1
+        performance.total_time += (end_time - begin_time)
+        performance.total_mem += memory_usage
+
+        return result
+
+    return calculate_perf