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;

namespace ConsoleApp4
{
    class Program
    {
        static void Main(string[] args)
        {
            int a = int.Parse(System.Console.ReadLine());
            long[] nm = Array.ConvertAll(System.Console.ReadLine().Split(' '), long.Parse);
            long mal = nm[0];
            for(int i=0; i<a;i++)
            {
                if (nm[i] == 0)
                {
                    Console.WriteLine(-1);
                    return;
                }
            }
            for (int i=1; i<a;i++)
            {  
                try
                {
                    checked
                    {
                        if (mal > 1000000000000000000)
                        {
                            Console.WriteLine(-1);
                            return;
                        }
                        mal *= nm[i];
                        if(mal>1000000000000000000)
                        {
                            Console.WriteLine(-1);
                            return;
                        }
                    }
                }
                catch(OverflowException ex)
                {
                    Console.WriteLine(-1);
                    return;
                }
                

            }
            System.Console.WriteLine(mal);

        }
    }
}