diff --git a/Week04/functions_ege_karatas.py b/Week04/functions_ege_karatas.py
new file mode 100644
index 00000000..9a62d20b
--- /dev/null
+++ b/Week04/functions_ege_karatas.py
@@ -0,0 +1,41 @@
+custom_power = lambda x, /, e=1: x**e
+
+
+def custom_equation(x: int = 0, y: int = 0, /, a: int = 1, b: int = 1, *, c: int = 1) -> float:
+    """
+    Calculates a custom mathematical equation: (x**a + y**b) / c.
+
+    :param x: The base for the first term, must be passed positionally.
+              Defaults to 0.
+    :type x: int
+    :param y: The base for the second term, must be passed positionally.
+              Defaults to 0.
+    :type y: int
+    :param a: The exponent for the first term, can be passed positionally or by keyword.
+              Defaults to 1.
+    :type a: int
+    :param b: The exponent for the second term, can be passed positionally or by keyword.
+              Defaults to 1.
+    :type b: int
+    :param c: The divisor, must be passed by keyword.
+              Defaults to 1.
+    :type c: int
+    :returns: The result of the calculation.
+    :rtype: float
+    """
+    return (x**a + y**b) / c
+
+
+def fn_w_counter(func):
+    total_calls = 0
+    caller_counts = {}
+
+    def wrapper(*args, **kwargs):
+        nonlocal total_calls, caller_counts
+
+        total_calls += 1
+        caller = func.__module__
+        caller_counts[caller] = caller_counts.get(caller, 0) + 1
+        return total_calls, caller_counts
+
+    return wrapper