diff --git "a/Week04/functions_\305\237erifburak_kalkan.py" "b/Week04/functions_\305\237erifburak_kalkan.py"
new file mode 100644
index 00000000..47c4f5b8
--- /dev/null
+++ "b/Week04/functions_\305\237erifburak_kalkan.py"
@@ -0,0 +1,27 @@
+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:
+    """
+    :param x: Positional-only base value for the first term; defaults to 0.
+    :param y: Positional-only base value for the second term; defaults to 0.
+    :param a: Exponent for `x`, can be used as positional or keyword; defaults to 1.
+    :param b: Exponent for `y`, can be used as positional or keyword; defaults to 1.
+    :param c: Keyword-only divisor for the result; defaults to 1.
+    :return: The result of the equation `(x**a + y**b) / c`.
+    :rtype: float.
+    """
+    return (x**a + y**b) / c
+ 
+
+def fn_w_counter() -> (int, dict[str, int]):
+    if not hasattr(fn_w_counter, "call_count"):
+        fn_w_counter.call_count = 0
+        fn_w_counter._dict = {}
+    caller_name = __name__
+    fn_w_counter.call_count += 1
+    if caller_name in fn_w_counter._dict:
+        fn_w_counter._dict[caller_name] += 1
+    else:
+        fn_w_counter._dict[caller_name] = 1
+    return fn_w_counter.call_count, fn_w_counter._dict