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)
    {
        //変数定義
        string[] input;

        //Inputします
        input = Console.ReadLine().Split(' ');

        if (int.Parse(input[1]) % int.Parse(input[0]) == 0)
            Console.WriteLine(int.Parse(input[0]) + int.Parse(input[1]));
        else
            Console.WriteLine( int.Parse(input[1])- int.Parse(input[0]) );
        
    }
}