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: Runtime Error)

function Main(input) {

    input = input.split("");

    var a = input[0]
    var b = input[1]

    if (b % a == 0) {
        console.log(a + b);
    } else if {
        console.log(b - a);
    }
}

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