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: Wrong Answer)

using System;
using System.IO;
using System.Collections.Generic;
 
namespace ConsoleApp1
{
    class Program
    {
        static void Main(string[] args)
        {           
                var N = int.Parse(Console.ReadLine());
                var str = Console.ReadLine();
                long kai = 0;
 
                string[] arr = str.Split(' ');
                long[] longArray = new long[N];
                for (int i = 0; i < N; i++)
                {
                    longArray[i] = long.Parse(arr[i]);
                }
 
                if (N >= 2 && N <= 100000)
                {
                    for (int i = 0; i < N; i++)
                    {
                        if (longArray[i] >= 0 && longArray[i] <= 1000000000000000000)
                        {
                            if (i == 0)
                            {
                                kai = longArray[i];
                            }
                            else
                            {
                                kai *= longArray[i];
                            }
                        }
                        else
                        {
                            kai = -1;
                            break;
                        }
                    }
 
                    if (kai != -1)
                    {
 
                        if (kai <= 1000000000000000000)
                        {
                            Console.WriteLine(kai);
                        }
                        else
                        {
                          	kai = -1;
                            Console.WriteLine($"{kai}");
                        }
                    }
                }
          		else
                {
                  Console.WriteLine(0);
                }
        }
    }
}