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) {
		try (Scanner scn = new Scanner(System.in)) {
			int N = scn.nextInt();
			long[] a = new long[N];

			for(int i = 0; i < N; i++) {
				a[i] = scn.nextLong();
				if(a[i] == 0) {
					System.out.println(0);
					System.exit(0);
				}
			}

			long max = (long) Math.pow(10, 18);
			max++;

			long tmp = a[0];
			for(int i = 1; i < N; i++){
				if(tmp * a[i] / max >= 1 || tmp * a[i] < tmp) {
					System.out.println(-1);
					System.exit(0);
				}
				tmp *= a[i];
			}
			System.out.println(tmp);
		}
	}
}