Problem Statement

You are on a social networking site called twiblr. In twiblr, you can follow at most $2\,\times\,($ the number of users following you $)\,+\,100$ users. You are currently following $B$ users, and $A$ users are following you. At most, how many extra users can you follow now?

Constraints

• $0 \le A, B \le 10000$
• $B \le 2 \times A + 100$
• All values in input are integers.

Input

Input is given from Standard Input in the following format:

A B

Output

Print the maximum number of extra users you can follow now.