diff --git a/Week04/functions_abdulatif_favaz.py b/Week04/functions_abdulatif_favaz.py
new file mode 100644
index 00000000..8b653484
--- /dev/null
+++ b/Week04/functions_abdulatif_favaz.py
@@ -0,0 +1,39 @@
+import sys
+
+
+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 custom equation.
+
+    :param x: Base value of the first term.
+    :param y: Base value of the second term.
+    :param a: Exponent applied to ``x``.
+    :param b: Exponent applied to ``y``.
+    :param c: Divisor of the final sum.
+    :return: The result of ``(x**a + y**b) / c`` as a float.
+    """
+    return float((x ** a + y ** b) / c)
+
+
+def fn_w_counter() -> tuple[int, dict[str, int]]:
+    caller_name = sys._getframe(1).f_globals.get("__name__", "<unknown>")
+
+    fn_w_counter.total_calls += 1
+    fn_w_counter.callers[caller_name] = fn_w_counter.callers.get(caller_name, 0) + 1
+
+    return fn_w_counter.total_calls, dict(fn_w_counter.callers)
+
+
+fn_w_counter.total_calls = 0
+fn_w_counter.callers = {}