diff --git a/Week04/functions_turhan_gunduzoglu.py b/Week04/functions_turhan_gunduzoglu.py
new file mode 100644
index 00000000..4b18359d
--- /dev/null
+++ b/Week04/functions_turhan_gunduzoglu.py
@@ -0,0 +1,24 @@
+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:
+    
+    """
+    Calculates the mathematical equation.
+
+    :param x: The first base value.
+    :param y: The second base value.
+    :param a: The exponent for x.
+    :param b: The exponent for y.
+    :param c: The divisor.
+    :return: The result of the equation.
+    """
+
+    res = float((x ** a + y**b) / c)
+    return res
+
+def fn_w_counter() -> (int,dict[str,int]):
+    if not hasattr(fn_w_counter, "counter"):
+        fn_w_counter.counter = 0
+    fn_w_counter.counter += 1
+    return fn_w_counter.counter, {__name__: fn_w_counter.counter}
+