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 Go (1.6) (judge verdict: Accepted)

package main

import (
	"fmt"
	"os"
)

func ReadInt(f *os.File) int {
	var n int
	fmt.Fscanf(f, "%d", &n)
	return n
}

func main() {
	A := ReadInt(os.Stdin)
	B := ReadInt(os.Stdin)
	if B%A == 0 {
		fmt.Println(A + B)
	} else {
		fmt.Println(B - A)
	}
}