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;
class Multiplication2
    {
        static void Main()
        {
            var n = int.Parse(Console.ReadLine());
            String[] a = Console.ReadLine().Split();
            long sum = 1;
            int frag = 0;
            for(int i = 0; i < n; i++)
            {
                if (long.Parse(a[i]) == 0)
                {
                    frag = 1;
                    break;
                }
            }
            for (int i = 0; i < n; i++)
            {
                sum *= long.Parse(a[i]);
                if(sum > 1000000000000000000 && frag!=1)
                {
                    sum = -1;
                    break;
                }
            }
            Console.WriteLine(sum);
        }
    }