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.Scanner;


public class Main {
		public static void main (String args[]) throws Exception{
		Scanner scan = new Scanner(System.in);
		int  n = scan.nextInt();
		long a[] = new long[n];
		Long max = Long.parseLong("1000000000000000000");
		// 0が含まれる場合
		for(int i = 0; i < n; i++) {
			a[i] = scan.nextLong();
			if(a[i] == 0) {
				System.out.println(0);
				return;
			}
		}
		long ans = a[0];
		for(int i = 1; i < n; i++) {
			if(ans > max / a[i]) {
				ans = -1;
				break;
			} else {
				ans = ans * a[i];
			}
		}
		System.out.println(ans);
	}
}