diff --git a/Algo/B2/Exercises/Repetitive tutorial.md b/Algo/B2/Exercises/Repetitive tutorial.md
index f3469d5..28317c3 100644
--- a/Algo/B2/Exercises/Repetitive tutorial.md	
+++ b/Algo/B2/Exercises/Repetitive tutorial.md	
@@ -84,7 +84,17 @@ def fibo(n):
 		n -= 1
 	return cur
 # OR
-
+def fibo(n):
+	prev = 1
+	cur = 1
+	i = 1
+	while n > 1:
+		prev += cur
+		cur += prev
+		i += 2
+	if
+		return cur
+	else return prev
 ```
 
 ## Exercise 1.5