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();
	    string[] lines = input.Split(' ');
	    
	    int divisor = int.Parse(lines[0]);
	    int dividend = int.Parse(lines[1]);
	    
	    int outputNumber = 0;
	    
	    if (dividend % divisor == 0) {
	        outputNumber = divisor + dividend;
	    } else {
	        outputNumber = dividend - divisor;
	    }
	    
	    string outputLine = outputNumber.ToString();
		Console.WriteLine(outputLine);
	}
}