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>

int main(void) {
	int a, b;
	int rem;

	do {

		scanf("%d", &a);
		scanf("%d", &b);
	} while (a <= 0 || b <= 0 || b < a || a>20 || b > 20);
	rem = b % a;
	if (rem > 0) {
		int tmp = b - a;
		printf("%d-%d=%d\n", b, a, tmp);
	}
	else {
		int tmp = a + b;
		printf("%d+%d=%d\n", a, b, tmp);
	}


	return 0;

}