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 (GCC 5.4.1) (judge verdict: Accepted)

/*
 * A.c
 *
 *  Created on: 2019/02/17
 *      Author: X250
 */


#include <stdio.h>

int main(void) {
	int A,B,ans;
	scanf("%d%d",&A,&B);
	if(B%A==0)ans=A+B;
	else ans=B-A;
	printf("%d",ans);
}