diff --git a/Week04/functions_ebru_koksal.py b/Week04/functions_ebru_koksal.py
new file mode 100644
index 00000000..483539a0
--- /dev/null
+++ b/Week04/functions_ebru_koksal.py
@@ -0,0 +1,20 @@
+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 :
+  """
+   This function returns the result of an operation based on the specified base and exponent values.
+
+   :param x: First base value
+   :param y: Second base value
+   :param a: First exponent value
+   :param b: Second exponent value
+   :param c: Divisor value
+   :return: (x**a + y**b)/c
+  """
+  return (x**a + y**b)/c
+
+def fn_w_counter() -> (int, dict[str, int]):
+  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}