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;

class Program
{
    static void Main(string[] args)
    {
        String input = Console.ReadLine();
        int output = Conpute(input);
        Console.WriteLine(output);
    }
  
    public static int Conpute(String arg)
    {
        var input = arg.Split(' ');
        var inputs = Array.ConvertAll<String, int>(input, s => int.Parse(s));

        var a = inputs[0];
        var b = inputs[1];

        if (b % a == 0)
        {
            return a + b;
        }
        else
        {
            return b - a;
        }
    }
}