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?

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.

Constraints

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

Sample Input 1

200 300

Sample Output 1

200

You can follow at most $2 \times 200 + 100 = 500$ users, that is, 200 more users than you are following now.

Sample Input 2

10000 0

Sample Output 2

20100

见题面 Input 部分

见题面 Output 部分