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 Rust (1.15.1) (judge verdict: Accepted)

use std::io;

fn read() -> Vec<i32> {
    let mut input = String::new();
    io::stdin().read_line(&mut input).unwrap();
    input.trim().split(' ').map(|x| x.parse().ok().unwrap()).collect()
}
fn main() {
    let input = read();
    let ans = if input[1] % input[0] == 0 {input[0] + input[1]} else {input[1] - input[0]};
    println!("{}", ans);
}