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 (Clang 3.8.0) (judge verdict: Runtime Error)

#include <stdio.h>

int main(void){
	int N,M;
	scanf("%d %d",&N,&M);
	int K[N];
	int A[N][M];
	int n,kn;
	int count;
	int ans=0;
	int i,j,k;
	for(i=0; i<N; i++){
		printf("CHACK");
		scanf("%d",&K[i]);
		for(j=0; j<K[i]; j++){
			scanf("%d",&A[i][j]);
		}
	}

	for(k=1; k<=M; k++){
		count=0;
		for(i=0; i<N; i++){
			for(j=0; j<K[i]; j++){
				if(k==A[i][j]){
					count++;
				}
			}
		}
		if(count==N){
			ans++;
		}
	}

	printf("%d\n",ans);
}