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)

fn main() {
    let (first, second) = {
        let input = get_input_read_line();
        let numbers : Vec<i32> = input
                                    .split(" ")
                                    .map(|value| value.trim().parse().unwrap())
                                    .collect();
        (numbers[0], numbers[1])
    };

    match second % first {
        0 => println!("{:?}", first + second),
        _ => println!("{:?}", second - first)
    };
}

fn get_input_read_line() -> String {
    let mut input = String::new();
    std::io::stdin().read_line(&mut input).ok();
    input
}