diff --git a/Week04/functions_egehan_hatipoglu.py b/Week04/functions_egehan_hatipoglu.py
new file mode 100644
index 00000000..8c71551a
--- /dev/null
+++ b/Week04/functions_egehan_hatipoglu.py
@@ -0,0 +1,38 @@
+import inspect
+
+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:
+    """
+    Calculate a mathematical equation.
+
+    :param x: First integer
+    :param y: Second integer
+    :param a: First exponent
+    :param b: Second exponent
+    :param c: Divisor
+    :return: Equation result
+    """
+    return (x**a + y**b) / c
+
+
+counter = 0
+callers = {}
+
+
+def fn_w_counter() -> tuple[int, dict[str, int]]:
+  
+    global counter
+
+    counter += 1
+
+    caller = inspect.currentframe().f_back.f_globals["__name__"]
+
+    if caller in callers:
+        callers[caller] += 1
+    else:
+        callers[caller] = 1
+
+    return counter, callers.copy()