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;

namespace A
{
	class Program
	{
		static void Main(string[] args)
		{
			var line = Console.ReadLine();
			var lineSplited = line.Split(new char[] {' '}, StringSplitOptions.RemoveEmptyEntries);

			var A = int.Parse(lineSplited[0]);
			var B = int.Parse(lineSplited[1]);

			if (B % A == 0) {
				Console.WriteLine(A + B);
			} else {
				Console.WriteLine(B - A);
			}
		}
	}
}