Problem:
Score : 200 points

Problem Statement

Given N integers A_1, ..., A_N, compute A_1 \times ... \times A_N.

However, if the result exceeds 10^{18}, print -1 instead.

Constraints

2 \leq N \leq 10^5

0 \leq A_i \leq 10^{18}

All values in input are integers.

Input

Input is given from Standard Input in the following format:

N
A_1 ... A_N

Output

Print the value A_1 \times ... \times A_N as an integer, or -1 if the value exceeds 10^{18}.

Sample Input 1

2
1000000000 1000000000

Sample Output 1

1000000000000000000

We have 1000000000 \times 1000000000 = 1000000000000000000.

Sample Input 2

3
101 9901 999999000001

Sample Output 2

-1

We have 101 \times 9901 \times 999999000001 = 1000000000000000001, which exceeds 10^{18}, so we should print -1 instead.

Sample Input 3

31
4 1 5 9 2 6 5 3 5 8 9 7 9 3 2 3 8 4 6 2 6 4 3 3 8 3 2 7 9 5 0

Sample Output 3

0

Solution in PHP (7.4.4) (judge verdict: Accepted)

<?php
$loop = trim(fgets(STDIN));
$nums_input = trim(fgets(STDIN));

$nums = explode(" ", $nums_input);
$result = 1;
$max_num = 1000000000000000000;

for ($i = 0;$i < $loop;$i++) {
    if ($nums[$i] == 0) {
        $result = 0;
        break;
    }
}

if ($result !== 0) {
    for ($i = 0;$i < $loop;$i++) {
        $result = $result * $nums[$i];
        if ($result > $max_num) {
            $result = -1;
            break;
        }
    }
}

print $result;