diff --git a/Week04/functions_aygul_ozkeklik.py b/Week04/functions_aygul_ozkeklik.py
new file mode 100644
index 00000000..1aa53336
--- /dev/null
+++ b/Week04/functions_aygul_ozkeklik.py
@@ -0,0 +1,10 @@
+custom_power = lambda x, e: x ** e
+
+def custom_equation(x, y, a, b, c):
+    return (x**a + y**b) / c
+
+def fn_w_counter():
+    if not hasattr(fn_w_counter, "count"):
+        fn_w_counter.count = 0
+    fn_w_counter.count += 1
+    return fn_w_counter.count, {__name__.split('.')[-1]: fn_w_counter.count}