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 Java8 (OpenJDK 1.8.0) (judge verdict: Runtime Error)

public class Main {
    
    public static void main(int arg[]) {
        System.out.println("start test");
        //約数のとき
        int a = arg[0];
        int b = arg[1];
        int c = b / a;
        
        if(c == 0) {
            System.out.println(a + b);
        } else {
        //約数でない時
            System.out.println(b - a);
        }
    }
}