diff --git a/Week04/functions_beytullah_arslan.py b/Week04/functions_beytullah_arslan.py
new file mode 100644
index 00000000..78a09c78
--- /dev/null
+++ b/Week04/functions_beytullah_arslan.py
@@ -0,0 +1,28 @@
+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:
+    """
+   This function calculates a custom equation with the given five integers.
+
+    :param x: First base value
+    :param y: Second base value
+    :param a: Exponent of variable x
+    :param b: Exponent of variable y
+    :param c: Divisor value
+    :return: The float result of the operation
+    """
+
+    return (x**a + y**b) / c
+
+def fn_w_counter() -> (int, dict[str, int]):
+    if not hasattr(fn_w_counter,'call_counter'):
+        fn_w_counter.call_counter = 0
+        fn_w_counter.caller_dict = {}
+    caller = __name__
+    fn_w_counter.call_counter += 1
+    if caller in fn_w_counter.caller_dict:
+        fn_w_counter.caller_dict[caller] += 1
+    else:
+        fn_w_counter.caller_dict[caller] = 1
+    return fn_w_counter.call_counter,fn_w_counter.caller_dict
+