Problem Statement

You are given two integers A and B.
Find the largest value among A+B, A-B and $A \times B$.

Input

Input is given from Standard Input in the following format:
A B

Output

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

Constraints

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

Sample Input 1

3 1

Sample Output 1

4

3+1=4, 3-1=2 and $3 \times 1=3$. The largest among them is 4.

Sample Input 2

4 -2

Sample Output 2

6

The largest is 4 - (-2) = 6.

Sample Input 3

0 0

Sample Output 3

0

见题面 Input 部分

见题面 Output 部分