diff --git a/Week04/functions_fevzi_bagriacik.py b/Week04/functions_fevzi_bagriacik.py
new file mode 100644
index 00000000..46b79066
--- /dev/null
+++ b/Week04/functions_fevzi_bagriacik.py
@@ -0,0 +1,31 @@
+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 (x ** a + y ** b) / c 
+    
+    :param arg1: First number (positional-only). Default to 0.
+    :param arg2: Second number (positional-only). Default to 0.
+    :param arg3: Third number (positional or keyword). Default to 1.
+    :param arg4: Fourth number (positional or keyword). Default to 1.
+    :param arg5: Fifth number (keyword-only). Default to 1.
+    :return: (x ** a + y ** b) / c.
+    """
+    
+    return (x ** a + y ** b) / c
+    
+def fn_w_counter() -> (int, dict[str, int]):
+    if not hasattr(fn_w_counter, 'total_count'):
+        fn_w_counter.total_count = 0
+        fn_w_counter.caller_dict = {}
+
+    caller_name = fn_w_counter.__module__
+
+    fn_w_counter.total_count += 1
+
+    if caller_name in fn_w_counter.caller_dict:
+        fn_w_counter.caller_dict[caller_name] += 1
+    else:
+        fn_w_counter.caller_dict[caller_name] = 1
+
+    return fn_w_counter.total_count, fn_w_counter.caller_dict