diff --git a/Algo/B2/Exercises/Repetitive tutorial.md b/Algo/B2/Exercises/Repetitive tutorial.md
index ac8a4d8..c0e3037 100644
--- a/Algo/B2/Exercises/Repetitive tutorial.md	
+++ b/Algo/B2/Exercises/Repetitive tutorial.md	
@@ -32,6 +32,18 @@ def multiplication2(x: int, y: int) -> int: # Thanks Hugo :p
 	else
 		return multiplication(x, y)
 
+def productZ(x, y):
+	pos = True
+	if x < 0:
+		x = -x 
+		pos = False
+	if y < 0:
+		y = -y
+		pos = not pos
+	m = multiplication(x, y)
+	if not pos:
+		m = -m
+	return m
 ```
 
 ## Exercise 1.3