diff --git a/Week04/decorators_miray_cengil.py b/Week04/decorators_miray_cengil.py
new file mode 100644
index 00000000..b7b83466
--- /dev/null
+++ b/Week04/decorators_miray_cengil.py
@@ -0,0 +1,60 @@
+import time
+import sys
+
+def performance(func):
+    """
+    A decorator to measure the performance of a function.
+
+    Attributes:
+        counter: The number of times the function has been called.
+        total_time: The total time the function has taken to run.
+        total_mem: The total memory used by the function in bytes.
+    """
+
+    if not hasattr(performance, 'counter'):
+        performance.counter = 0
+    if not hasattr(performance, 'total_time'):
+        performance.total_time = 0.0
+    if not hasattr(performance, 'total_mem'):
+        performance.total_mem = 0
+
+    def wrapper(*args, **kwargs):
+        # Record the start time
+        start_time = time.time()
+        
+        # Call the actual function and calculate memory usage
+        result = func(*args, **kwargs)
+        memory_usage = sys.getsizeof(result)
+        
+        # Calculate time taken
+        time_taken = time.time() - start_time
+        
+        # Update the statistics
+        performance.counter += 1
+        performance.total_time += time_taken
+        performance.total_mem += memory_usage
+        
+        return result
+    
+    return wrapper
+
+# Test functions
+@performance
+def example_function(x):
+    time.sleep(x)
+    return x ** 2
+
+@performance
+def memory_intensive_function(size):
+    return [0] * size
+
+if __name__ == "__main__":
+    # Run test functions
+    example_function(1)
+    example_function(2)
+    memory_intensive_function(1000000)
+    
+    # Display performance metrics
+    print(f"Function called {performance.counter} times.")
+    print(f"Total time taken: {performance.total_time:.4f} seconds.")
+    print(f"Total memory used: {performance.total_mem / 1024:.2f} KB.")