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
  $tmp = explode(" ", trim(fgets(STDIN)));
  $a = $tmp[0];
  $b = $tmp[1];

  $num1 = $a+$b;
  $num2 = $a-$b;
  $num3 = $a*$b;

  if($num1>$num2 && $num1>$num3){
    echo $num1;
  }else if($num2>$num1 && $num2>$num3){
    echo $num2;
  }else if($num3>$num1 && $num3>$num2){
    echo $num3;
  }
  echo "\n";