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: Wrong Answer)

#include<stdio.h>
#include<stdlib.h>
int main()
{
    int a,b,i;
    for(i=1; i<=3; i++)
    {
        scanf("%d %d",&a,&b);
        if (a==b)
        {
            printf("%d\n%d is divisor of %d.\n\n",a+b,a,b);
        }
        else if(b%a == 0)
        {
            printf("%d\n",a+b);
        }

        else
        {
            printf("%d\n",b-a);
        }
    }
    return 0;
}