diff --git a/Week04/custom_equation_gamze_kilinc.py b/Week04/custom_equation_gamze_kilinc.py
new file mode 100644
index 00000000..73db232f
--- /dev/null
+++ b/Week04/custom_equation_gamze_kilinc.py
@@ -0,0 +1,20 @@
+def custom_equation(
+    x: int = 0,
+    y: int = 0,
+    /,
+    a: int = 1,
+    b: int = 1,
+    *,
+    c: int = 1
+) -> float:
+    """
+    Calculates a custom mathematical equation.
+
+    :param x: First positional-only integer value.
+    :param y: Second positional-only integer value.
+    :param a: Exponent for x.
+    :param b: Exponent for y.
+    :param c: Divisor value.
+    :return: The result of (x**a + y**b) / c as a float.
+    """
+    return (x ** a + y ** b) / c