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: Wrong Answer)

use std::io;

fn main(){
    let stdin = io::stdin();

    let first_line = {
	let mut buf = String::new();
	stdin.read_line(&mut buf).unwrap();
	buf.retain(|c| c!='\n');
	buf.parse::<usize>().unwrap()
    };
    if first_line > 0{
	let second_line : Vec::<u64> = {
	    let mut buf = String::new();
	    stdin.read_line(&mut buf).unwrap();
	    buf.retain(|c| c!='\n');
	    buf.split_ascii_whitespace().map(|n| n.parse().unwrap()).collect()
	};

	let mut res = 1;
	let  ch = 1_000_000_000_000_000_000_u64;
	for n in second_line{
	    res *= n;
      	if res == 0{
          break;
      	}
	}

	if ch < res {println!("{}",-1);}else{println!("{}",res);}
    }
}