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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 $B - A$.

4 12

### Sample Output 1

16

As $4$ is a divisor of $12$, $4 + 12 = 16$ should be printed.

8 20

12

1 1

### Sample Output 3

2

$1$ is a divisor of $1$.