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.*;
 
public class Main {
    public static void main(String[] args) throws Exception {
		Scanner sc = new Scanner(System.in);
        int n = sc.nextInt();
      	long[] a = new long[n];
        long std = 1000000000000000000L;
      	for (int i=0; i < n; i++) {
          a[i]= sc.nextLong();
          if (a[i] == 0) {
            System.out.println(0);
            return;
          }
        }
      
        long seki = a[0];
        for(int i=1; i < n; i++) {
          if (a[i] <= (std / seki)) {
            seki *= a[i];
          } else {
            System.out.println(-1);
          	return;
          }
        }
        System.out.println(seki);
    }
}