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 Java7 (OpenJDK 1.7.0) (judge verdict: Accepted)

import java.io.BufferedReader;
import java.io.InputStreamReader;

public class Main {

	public static void main(String[] args) {
		// TODO Auto-generated method stub
		String[] s = readLine().split(" ");
		int a = Integer.parseInt(s[0]);
		int b = Integer.parseInt(s[1]);
		if(b%a==0){
			System.out.println(a+b);
		}else{
			System.out.println(b-a);
		}
		return;
	}

	private static String readLine(){
		BufferedReader reader = new BufferedReader(new InputStreamReader(System.in));
		try{
			return reader.readLine();
		}catch(Exception e){
			return e.getMessage();
		}
	}
}