diff --git a/Week04/Week04/functions_bredikhin_illia.py b/Week04/Week04/functions_bredikhin_illia.py
new file mode 100644
index 00000000..dab6c9e6
--- /dev/null
+++ b/Week04/Week04/functions_bredikhin_illia.py
@@ -0,0 +1,26 @@
+power_fn = lambda base=0, /, exp=1: base ** exp
+
+
+def calc_expression(x: int = 0, y: int = 0, /, a: int = 1, b: int = 1, *, c: int = 1) -> float:
+    """
+    Calculates (x^a + y^b) / c
+    """
+    result = (x ** a + y ** b) / c
+    return result
+
+
+def call_tracker() -> tuple[int, dict[str, int]]:
+    if not hasattr(call_tracker, "_count"):
+        call_tracker._count = 0
+        call_tracker._by_caller = {}
+
+    module_name = __name__
+
+    call_tracker._count += 1
+
+    if module_name in call_tracker._by_caller:
+        call_tracker._by_caller[module_name] += 1
+    else:
+        call_tracker._by_caller[module_name] = 1
+
+    return call_tracker._count, call_tracker._by_caller