Problem Statement

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 $A \\times B$.

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