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 C# (Mono 4.6.2.0) (judge verdict: Accepted)

using System;

public class Program {
  public static void Main(string[] args) {
    var str = Console.ReadLine().Split(' ');
    var a = int.Parse(str[0]);
    var b = int.Parse(str[1]);
    if (b % a  == 0) {
      Console.WriteLine(a + b);
    } else {
      Console.WriteLine(b - a);
    }
  }
}