diff --git a/Algo/B2/Exercises/Repetitive tutorial.md b/Algo/B2/Exercises/Repetitive tutorial.md
index a75c5ae..f6e3bf2 100644
--- a/Algo/B2/Exercises/Repetitive tutorial.md	
+++ b/Algo/B2/Exercises/Repetitive tutorial.md	
@@ -118,7 +118,17 @@ def my_sum(n: int) -> int:
 	return s
 ```
 2) 
-```
-def my_sum()
-
+```python
+def my_sum(n: int) -> int:
+	ss = 0
+	i = 1
+	while i <= n:
+		si = 0
+		j = 1
+		while j <= i:
+			si += u(j)
+			j += 1
+		ss += si
+		i += 1
+	return ss
 ```
\ No newline at end of file