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

namespace ABC118
{
	class Program
	{
		static void Main(string[] args)
		{
			int a, b,s ;
			var word = Console.ReadLine().Split(' ');
			a = int.Parse(word[0]);
			b = int.Parse(word[1]);
			s = 0;
			if (b % a == 0)
			{
				s = a + b;
			}
			else
			{
				s = b - a;
			}
			Console.WriteLine(s);
			Console.ReadKey();
		}
	}
}