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: Accepted)

#include<stdio.h>

int main(void){
  int A,B;
  int flag = 0;
  
 scanf("%d",&A); 
 scanf("%d",&B); 
if(A == 1 || A==B){
  flag = 1;
}else{
  for(int i=1;i<B;i++){
if(B%i == 0){
if(A == i){
  flag = 1;
}
}
  }
}
  if(flag == 1){
	printf("%d",A+B);
  }else{
    printf("%d",B-A);
}
}