diff --git a/Week04/functions_dilek_celebi.py b/Week04/functions_dilek_celebi.py
new file mode 100644
index 00000000..cf8a178a
--- /dev/null
+++ b/Week04/functions_dilek_celebi.py
@@ -0,0 +1,25 @@
+from collections import defaultdict
+
+custom_power = lambda base=0, /, exponent=1: base**exponent
+
+def custom_formula(x: int = 0, y: int = 0, /, exp_x: int = 1, exp_y: int = 1, *, divisor: int = 1) -> float:
+    """
+    :param x: Positional-only integer base for the equation, default is 0
+    :param y: Positional-only integer base for the equation, default is 0
+    :param exp_x: Positional-or-keyword integer exponent for x, default is 1
+    :param exp_y: Positional-or-keyword integer exponent for y, default is 1
+    :param divisor: Keyword-only integer divisor, default is 1
+    :return: Result of (x**exp_x + y**exp_y) / divisor as a float
+    """
+    return (x**exp_x + y**exp_y) / divisor
+
+def function_with_counter() -> (int, dict[str, int]):
+    if not hasattr(function_with_counter, '_total_calls'):
+        function_with_counter._total_calls = 0
+        function_with_counter._module_calls = defaultdict(int)
+    
+    current_module = "__name__"
+    function_with_counter._total_calls += 1
+    function_with_counter._module_calls[current_module] += 1
+    
+    return function_with_counter._total_calls, dict(function_with_counter._module_calls)