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 C# (.NET Core 3.1.201) (judge verdict: Accepted)

using System;
using System.Linq;
using System.Numerics;

namespace _169_b
{
    internal class Multiplication2
    {
        private static void Main(string[] args)
        {
            var n = int.Parse(Console.ReadLine() ?? throw new InvalidOperationException());
            var a = Console.ReadLine()?.Split(" ").Select(long.Parse).ToArray();
            if (a == null) return;

            if (a.Contains(0))
            {
                Console.WriteLine(0);
                return;
            }

            BigInteger result = 1;
            for (var i = 0; i < n; i++)
            {
                result *= a[i];
                if (result > 1000000000000000000)
                {
                    Console.WriteLine(-1);
                    return;
                }
            }

            Console.WriteLine(result);
        }
    }
}