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
$stdin = explode(" ",fgets(STDIN));

$a = (int)$stdin[0];
$b = (int)$stdin[1];

$result = array();
$result[0] = $a + $b;
$result[1] = $a - $b;
$result[2] = $a * $b;
echo max($result);
?>