# Fair Distribution

Limits
1s, 512 MB

Mr. Forhad has $X$ children. One day, on his way home, he bought $Y$ chocolates for his children. He doesn't know if he can divide these $Y$ chocolates equally among his $X$ children. If he can’t, then he must buy some more chocolates so that he can divide the chocolates equally among his children.

Now, you need to write a program to help Mr. Forhad determine the minimum number of additional chocolates that he needs to buy so that he can make the distribution fair.

## Input

Each line will have two integers $X$ and $Y$ ($0 < X, Y \le 150$) where $X$ is the number of children that Mr. Forhad has and $Y$ is the number of chocolates that Mr. Forhad has already bought.

## Output

You must print one integer which is the minimum number of additional chocolates that Mr. Forhad needs to buy.

## Sample