diff --git a/Algo/B2/Exercises/Repetitive tutorial.md b/Algo/B2/Exercises/Repetitive tutorial.md
index cddd208..ab006ed 100644
--- a/Algo/B2/Exercises/Repetitive tutorial.md	
+++ b/Algo/B2/Exercises/Repetitive tutorial.md	
@@ -219,6 +219,7 @@ def prime(n: int) -> int:
 		while d*d <= n and n % d!= 0:
 			d += 2
 		return d*d > n
+```
 ## Exercise 3.3
 ```python
 def quotient(a: int, b: int) -> int: