p03125 AtCoder Beginner Contest 118 - B +/- A
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.

Examples

Input

4 12


Output

16


Input

8 20


Output

12


Input

1 1


Output

2
```python
a,b = list(map(int,input().split()))
print(a+b if b%a == 0 else b-a)

```