Problem:
Score : 100 points

Problem Statement

Compute A \times B.

Constraints

1 \leq A \leq 100

1 \leq B \leq 100

All values in input are integers.

Input

Input is given from Standard Input in the following format:

A B

Output

Print the value A \times B as an integer.

Sample Input 1

2 5

Sample Output 1

10

We have 2 \times 5 = 10.

Sample Input 2

100 100

Sample Output 2

10000

Solution in PHP (7.4.4) (judge verdict: Wrong Answer)

<?php
$a = fgets(STDIN);
$ts = explode(" ",trim(fgets(STDIN)));
$sum = 1;
for ($i=0;$i<intval($a);$i++){
  $sum *= $ts[$i];
}
if($sum == 0){
  echo $sum;
  exit;
}elseif($sum >= 10**18){
  $sum = '-1';
}
echo $sum;