Score : $100$ points
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 is given from Standard Input in the following format:
Print the maximum number of extra users you can follow now.
You can follow at most $2 \times 200 + 100 = 500$ users, that is, $200$ more users than you are following now.