diff --git a/Week04/functions_basak_kocan.py b/Week04/functions_basak_kocan.py
new file mode 100644
index 00000000..b4e6a7cc
--- /dev/null
+++ b/Week04/functions_basak_kocan.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:
+  """
+  This function calculates the value of the equation (x**a + y**b) / c.
+
+  :param x: Positional-only base value for the first term, default value is 0.
+  :param y: Positional-only base value for the second term, default value is 0.
+  :param a: Exponent for 'x', default value is 1.
+  :param b: Exponent for 'y', default value is 1.
+  :param c: Divisor of the equation, default value is 1.
+
+  :type x: int
+  :type y: int
+  :type a: int
+  :type b: int
+  :type c: int
+
+  :return: The result of the custom 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.callers_dict = {}
+  
+  fn_w_counter.call_count += 1
+  caller_name = __name__
+
+  if caller_name in fn_w_counter.callers_dict:
+    fn_w_counter.callers_dict[caller_name] += 1
+  else:
+    fn_w_counter.callers_dict[caller_name] = 1
+  
+  return fn_w_counter.call_count, fn_w_counter.callers_dict