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: Wrong Answer)

function sub(foo) {
	var num = foo.split(' ');
    var str = 0;
    if(parseInt(num[0])%parseInt(num[1]) == 0) {
    	str = parseInt(num[1])-parseInt(num[0]);
    } else {
    	str = parseInt(num[0])+parseInt(num[1]);
    }
    return str;
}

function Main(ab) {
    console.log(sub(ab));
}

Main(require("fs").readFileSync("/dev/stdin", "utf8"));