diff --git a/Week04/functions_dilek_celebi.py b/Week04/functions_dilek_celebi.py
new file mode 100644
index 00000000..8a322ced
--- /dev/null
+++ b/Week04/functions_dilek_celebi.py
@@ -0,0 +1,26 @@
+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:
+    """
+    :param x: The positional-only integer base parameter for the equation , default is 0
+    :param y: The positional-only integer base parameter for the equation , default is 0
+    :param a: The positional-or-keyword integer exponent parameter for the equation , default is 1
+    :param b: The positional-or-keyword integer exponent parameter for the equation , default is 1
+    :param c: The keyword-only integer divisor parameter for the equation , default is 1
+    :return: The result of the calculation as a float and the equation is (x**a + y**b)/c
+    :rtype: float
+    """
+    return (x**a + y**b)/c
+
+def fn_w_counter() -> (int, dict[str, int]):
+    if not hasattr(fn_w_counter,'_call_counter'):
+        fn_w_counter._call_counter = 0
+        fn_w_counter._caller_dict = {}
+    caller = __name__
+    fn_w_counter._call_counter += 1
+    if caller in fn_w_counter._caller_dict:
+        fn_w_counter._caller_dict[caller] += 1
+    else:
+        fn_w_counter._caller_dict[caller] = 1
+    return fn_w_counter._call_counter,fn_w_counter._caller_dict