p03337 AtCoder Beginner Contest 098 - Add Sub Mul
You are given two integers A and B. Find the largest value among A+B, A-B and A \times B.

Constraints

* -1000 \leq A,B \leq 1000
* All values in input are integers.

Input

Input is given from Standard Input in the following format:


A B


Output

Print the largest value among A+B, A-B and A \times B.

Examples

Input

3 1


Output

4


Input

4 -2


Output

6


Input

0 0


Output

0
```python
A, B = map(int, input().split())
M = max(A+B,A-B,A*B)
print(M)
```