diff --git a/Week04/functions_egehan_hatipoglu.py b/Week04/functions_egehan_hatipoglu.py
new file mode 100644
index 00000000..16b2f0a6
--- /dev/null
+++ b/Week04/functions_egehan_hatipoglu.py
@@ -0,0 +1,33 @@
+def custom_equation(x: int, y: int, a: int, b: int, c: int) -> float:
+    """Calculates the custom equation.
+
+    :param x: first base
+    :type x: int
+    :param y: second base
+    :type y: int
+    :param a: first exponent
+    :type a: int
+    :param b: second exponent
+    :type b: int
+    :param c: divisor
+    :type c: int
+    :return: the result of (x**a + y**b) / c
+    :rtype: float
+    """
+    return float((x**a + y**b) / c)
+
+
+def fn_w_counter() -> tuple[int, dict[str, int]]:
+    if not hasattr(fn_w_counter, "total_count"):
+        fn_w_counter.total_count = 0
+        fn_w_counter.call_records = {}
+
+    caller = __name__
+    fn_w_counter.total_count += 1
+
+    if caller not in fn_w_counter.call_records:
+        fn_w_counter.call_records[caller] = 1
+    else:
+        fn_w_counter.call_records[caller] += 1
+
+    return fn_w_counter.total_count, fn_w_counter.call_records