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 static System.Console;
using System.Linq;

namespace AtCoder
{
  public class sora
  {
    static void Main(string[] args)
    {
      int N = int.Parse(ReadLine());
      long[] A = ReadLine().Split(' ').Select(long.Parse).ToArray();
      long check = 1;
      long ans = 1;
      for(int i = 0; i < N; i++){
        if(A[i] == 0){
          ans = 0;
          break;
        }
      }
      for(int i = 0; i < N; i++){
        ans *= A[i];
        if(ans / A[i] != check || 1000000000000000000 < ans){
          ans = -1;
          break;
        }
        check *= A[i];
      }
      WriteLine(ans);
    }
  }
}