Problem:
Score : 100 points

Problem Statement

You are given positive integers A and B.

If A is a divisor of B, print A + B; otherwise, print B - A.

Constraints

All values in input are integers.

1 \leq A \leq B \leq 20

Input

Input is given from Standard Input in the following format:

A B

Output

If A is a divisor of B, print A + B; otherwise, print B - A.

Sample Input 1

4 12

Sample Output 1

16

As 4 is a divisor of 12, 4 + 12 = 16 should be printed.

Sample Input 2

8 20

Sample Output 2

12

Sample Input 3

1 1

Sample Output 3

2

1 is a divisor of 1.

Solution in JavaScript (node.js v5.12) (judge verdict: Accepted)

function main(input) {
    const nums = input.trim().split(/\s/).map(str=>Number(str));
    const res = nums[1] % nums[0] === 0 ? nums[1] + nums[0] : nums[1] - nums[0];
    console.log(res);
}
main(require('fs').readFileSync('/dev/stdin', 'utf8'));