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 Scala (2.11.7) (judge verdict: Accepted)


object Main extends App {
  val AB = io.StdIn.readLine.split(' ')
  val A = AB.head.toInt
  val B = AB.last.toInt

  val out = B % A match {
    case 0 => B + A
    case _ => B - A
  }

  println(out)
}