diff --git a/Week04/functions_miray_cengil.py b/Week04/functions_miray_cengil.py
new file mode 100644
index 00000000..ddc31cce
--- /dev/null
+++ b/Week04/functions_miray_cengil.py
@@ -0,0 +1,37 @@
+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:
+    """
+    A function that calculates the custom equation:
+    
+    (x**a + y**b) / c
+    
+    :param x: positional-only integer, default 0
+    :param y: positional-only integer, default 0
+    :param a: positional-or-keyword integer, default 1
+    :param b: positional-or-keyword integer, default 1
+    :param c: keyword-only integer, default 1
+    :return: Result of the equation as a float
+    """
+    if c == 0:
+        raise ValueError("Division by Zero Exception")
+    return (x**a + y**b) / c
+
+def fn_w_counter() -> (int, dict[str, int]):
+    # Keep track of the call count and caller info without using modules
+    if not hasattr(fn_w_counter, "call_counter"):
+        fn_w_counter.call_counter = 0
+        fn_w_counter.caller_count_dict = {}
+
+    # Get the name of the caller
+    caller_name = __name__
+    fn_w_counter.call_counter += 1
+
+    # Increment the call count for this caller
+    if caller_name in fn_w_counter.caller_count_dict:
+        fn_w_counter.caller_count_dict[caller_name] += 1
+    else:
+        fn_w_counter.caller_count_dict[caller_name] = 1
+
+    # Return the total call count and the caller information
+    return fn_w_counter.call_counter, fn_w_counter.caller_count_dict