diff --git a/Week04/functions_rukiye_tura.py b/Week04/functions_rukiye_tura.py
new file mode 100644
index 00000000..be5898fe
--- /dev/null
+++ b/Week04/functions_rukiye_tura.py
@@ -0,0 +1,19 @@
+custom_power = lambda x=0,/,e=1 : x**e
+
+
+def custom_equation(x: int = 0, y: int = 0,/, a: int = 1, b: int = 1,*, c: int = 1) -> float:
+
+    return (x**a + y**b) / c
+
+
+def fn_w_counter() -> (int, dict[str, int]):
+    if not hasattr(fn_w_counter, "counter"):
+        fn_w_counter.counter = (0, {})
+    counter_num = fn_w_counter.counter[0]
+    counter_dict = fn_w_counter.counter[1]
+    if __name__ in counter_dict:
+        counter_dict[__name__] += 1
+    else:
+        counter_dict[__name__] = 1
+    fn_w_counter.counter = (counter_num + 1, counter_dict)
+    return fn_w_counter.counter