diff --git a/Week04/functions_berra_soyler.py b/Week04/functions_berra_soyler.py
new file mode 100644
index 00000000..646316fb
--- /dev/null
+++ b/Week04/functions_berra_soyler.py
@@ -0,0 +1,28 @@
+from typing import Callable, Tuple, Dict
+
+custom_power: Callable[[int, int], int] = 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:
+    """
+    Compute a custom equation.
+
+    :param x: An integer, positional-only, with default value 0
+    :param y: An integer, positional-only, with default value 0
+    :param a: An integer, positional-or-keyword, with default value 1
+    :param b: An integer, positional-or-keyword, with default value 1
+    :param c: An integer, keyword-only, with default value 1
+    :return: Result of (x**a + y**b) / c as a float
+    """
+    return (x ** a + y ** b) / c
+
+call_counter: Dict[str, int] = {}
+
+def fn_w_counter() -> Tuple[int, Dict[str, int]]:
+    """
+    Count the number of function calls and return caller information.
+
+    :return: A tuple containing the total number of calls and a dictionary with caller names as keys and call counts as values.
+    """
+    caller = "__main__"
+    call_counter[caller] = call_counter.get(caller, 0) + 1
+    return call_counter[caller], call_counter