diff --git a/Week04/functions_khaled_alismail.py b/Week04/functions_khaled_alismail.py
new file mode 100644
index 00000000..c7fe98bb
--- /dev/null
+++ b/Week04/functions_khaled_alismail.py
@@ -0,0 +1,46 @@
+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:
+    """
+    Evaluate the custom equation.
+
+    :param x: First integer base.
+    :param y: Second integer base.
+    :param a: Power used for ``x``.
+    :param b: Power used for ``y``.
+    :param c: Keyword-only divisor.
+    :return: The floating-point result of ``(x**a + y**b) / c``.
+    """
+    return float((x ** a + y ** b) / c)
+
+
+_counter_state = {
+    "total": 0,
+    "callers": {}
+}
+
+
+def fn_w_counter() -> tuple[int, dict[str, int]]:
+    frame = inspect.currentframe()
+    caller_frame = frame.f_back if frame else None
+    caller_name = "<unknown>"
+
+    if caller_frame is not None:
+        caller_name = caller_frame.f_globals.get("__name__", "<unknown>")
+
+    _counter_state["total"] += 1
+    _counter_state["callers"][caller_name] = _counter_state["callers"].get(caller_name, 0) + 1
+
+    return _counter_state["total"], dict(_counter_state["callers"])