diff --git a/Algo/B2/Exercises/Repetitive tutorial.md b/Algo/B2/Exercises/Repetitive tutorial.md
index 9902adb..aa1311b 100644
--- a/Algo/B2/Exercises/Repetitive tutorial.md	
+++ b/Algo/B2/Exercises/Repetitive tutorial.md	
@@ -54,4 +54,21 @@ def exponetial(x: int, n: int) -> int:
 		m *= x
 		n -= 1
 	return result
+
+def power(x, n):
+	if x == 0;
+		if n == 0:
+			raise Exception("0 power 0 undefinded")
+		else:
+			return 0
+	elif x == 1:
+		return 1
+	elif x == -1:
+		return (n%2)*(-2) + 1
+	else:
+		res = 1
+		while n > 0:
+			res *= x
+			n -= 1
+		return res
 ```