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: Wrong Answer)

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace abc_a
{
    class Program
    {
        static void Main(string[] args)
        {
            var inputs = Console.ReadLine().Split().Select(a => int.Parse(a)).ToArray();
            int A = inputs[0];
            int B = inputs[1];

            if (B % A == 0)
            {

                Console.WriteLine(A + B);
            }
            else
            {
                Console.WriteLine(A - B);

            }

        }
    }
}