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 Rust (1.42.0) (judge verdict: Accepted)

use std::io;
fn main() {
    let border : i64 = 10_i64.pow(18);

    let mut line = String::new();
    io::stdin().read_line(&mut line).expect("");
    let n = line.trim().parse().expect("");

    let mut line = String::new();
    io::stdin().read_line(&mut line).expect("");
    let mut vec : Vec<&str> = line.split_whitespace().collect();
    vec.sort();
    let mut result : i64 = 1;
    for i in 0..n {
        let num : i64 = vec[i].parse().unwrap_or(1);
        match result.checked_mul(num) {
            Some(v) => result = v,
            None => {
                result = -1;
                break;
            },
        };
    }

    if result > border {
        result = -1;
    }

    println!("{}", result);
}