diff --git a/Week04/functions_ensar_bastopcu.py b/Week04/functions_ensar_bastopcu.py
new file mode 100644
index 00000000..07eecdbe
--- /dev/null
+++ b/Week04/functions_ensar_bastopcu.py
@@ -0,0 +1,42 @@
+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:
+    """
+    Computes the result of the equation (x**a + y**b) / c.
+
+    :param x: The first base integer
+    :type x: int
+    :param y: The second base integer
+    :type y: int
+    :param a: The first exponent
+    :type a: int
+    :param b: The second exponent
+    :type b: int
+    :param c: The divisor
+    :type c: int
+    :return: The result of the equation as a float
+    :rtype: float
+    """
+    return (x**a + y**b) / c
+
+def fn_w_counter() -> tuple[int, dict]:
+    if not hasattr(fn_w_counter, 'total_calls'):
+        fn_w_counter.total_calls = 0
+        fn_w_counter.caller_counts = {}
+    
+    fn_w_counter.total_calls += 1
+    
+    try:
+        frame = inspect.currentframe().f_back
+        caller_name = frame.f_globals['__name__']
+    except (AttributeError, KeyError):
+        caller_name = 'unknown'
+
+    if caller_name in fn_w_counter.caller_counts:
+        fn_w_counter.caller_counts[caller_name] += 1
+    else:
+        fn_w_counter.caller_counts[caller_name] = 1
+        
+    return fn_w_counter.total_calls, fn_w_counter.caller_counts