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)

var stdin = require("fs").readFileSync("/dev/stdin", "utf8");
stdin = stdin.trim().split("\n").reverse();
function input(){return stdin.pop()}
var stdout = [];



var x = input().split(" ").map(n=>parseInt(n));
var a = x[0]
var b = x[1]
if (b % a){
    stdout.push(b - a)
}else{
    stdout.push(b + a)
}



stdout = stdout.join(" ");
console.log(stdout);