Problem:
Score : 100 points

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

Solution in PHP7 (7.0.15) (judge verdict: Accepted)

<?php
    list($a, $b) = explode(" ", trim(fgets(STDIN)));
    $ans = $a + $b;
    if($ans < $a - $b){
        $ans = $a - $b;
    }
    if($ans < $a * $b){
        $ans = $a * $b;
    }
    echo $ans;
?>