Problem:
Score : 100 points

Problem Statement

We have two integers: A and B.

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

Constraints

All values in input are integers.

-100 \leq A,\ B \leq 100

Input

Input is given from Standard Input in the following format:

A B

Output

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

Sample Input 1

-13 3

Sample Output 1

-10

The largest number among A + B = -10, A - B = -16, and A \times B = -39 is -10.

Sample Input 2

1 -33

Sample Output 2

34

The largest number among A + B = -32, A - B = 34, and A \times B = -33 is 34.

Sample Input 3

13 3

Sample Output 3

39

The largest number among A + B = 16, A - B = 10, and A \times B = 39 is 39.

Solution in PHP7 (7.0.15) (judge verdict: Wrong Answer)

<?php
fscanf(STDIN, "%d %d", $a, $b);

$sum = sum($a, $b);
$sub = sub($a, $b);
$multi = multi($a, $b);

$result = calculation($sum, $sub, $multi);

echo $result, PHP_EOL;

function sum(int $a, int $b): int
{
    return $a + $b;
}

function sub(int $a, int $b): int
{
    return $a - $b;
}

function multi(int $a, int $b): int
{
    return $a * $b;
}

function calculation(int $sum, int $sub, int $multi): int
{
    $result = $sum > $sub ? ($sum > $multi ? $sub : $multi) : ($sub > $multi ? $sub : $multi);
    return $result;
}