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 Kotlin (1.0.0) (judge verdict: Accepted)

/**
 * @author karayuu
 */
fun main(args: Array<String>) {
    val (a, b) = readLine()!!.split(" ").map { it.toInt() }
    if (b % a == 0) {
        println(a + b)
    } else {
        println(b - a)
    }
}