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}.

Examples

Input

2
1000000000 1000000000


Output

1000000000000000000


Input

3
101 9901 999999000001


Output

-1


Input

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


Output

0

import java.util.ArrayList;
import java.util.List;
import java.util.Scanner;

public class Main {

  final static Long MAX = 1000000000000000000L;
  public static void main(String[] args) {
    Scanner sc = new Scanner(System.in);
    int n = sc.nextInt();
    sc.nextLine();
    List<Long> l = new ArrayList<Long>();
    for(int i = 0;i < n;i++) {
      l.add(sc.nextLong());
    }

    if(l.contains(0L)) {
      System.out.println(0);
    }else {

      Long sum = 1L;

      for(Long l2:l) {
        if(sum > MAX/l2) {
          System.out.println(-1);
          sum = 0L;
          return;
        }
        sum *= l2;
      }
      System.out.println(sum);
    }

    sc.close();
  }

}
