diff --git a/Algo/B2/Exercises/Repetitive tutorial.md b/Algo/B2/Exercises/Repetitive tutorial.md
index 28317c3..806f235 100644
--- a/Algo/B2/Exercises/Repetitive tutorial.md	
+++ b/Algo/B2/Exercises/Repetitive tutorial.md	
@@ -88,13 +88,14 @@ def fibo(n):
 	prev = 1
 	cur = 1
 	i = 1
-	while n > 1:
+	while i < n:
 		prev += cur
 		cur += prev
 		i += 2
-	if
+	if i == n: # i % 2 == 1
 		return cur
-	else return prev
+	else: 
+		return prev
 ```
 
 ## Exercise 1.5