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: Runtime Error)

<?php

$str = fgets(STDIN);
$result = array();
for($i = 1; $i <mb_strlen($str) ;$i++) {
    $str1 = substr($str, 0 , $i);
    $str2 = substr($str, $i , mb_strlen($str) - $i);
    $str1_array = str_split($str1);

$result[$i] = 0;
    for ($k = 0; $k < count($str1_array); $k++) {
        $str2_array = str_split($str2);
        $searchChar = $str1_array[$k];

        if(in_array($searchChar,$str2_array)) {
            $result[$i]++;
            $str2  = str_replace($searchChar,"A",$str2);
        }
    }
}

echo max($result);
?>