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;
import java.util.stream.Stream;

public class Main {

	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		int len = Integer.parseInt(sc.nextLine());
		long[] line = Stream.of(sc.nextLine().split(" ", 0)).mapToLong(Long::parseLong).toArray();
		long ans = 1;
		long lev = 1000000000000000000L;
		boolean zeroFlg = false;
		for (int i = 0; i < line.length; i++) {
			if (line[i] == 0) {
				zeroFlg = true;
			}
		}

		if (zeroFlg == false) {
			for (int i = 0; i < line.length; i++) {
				if (line[i] <= lev / ans) {
					ans *= line[i];
				}else {
					ans = -1;
					break;
				}
			}
			System.out.println(ans);
		}else {
			System.out.println(0);
		}

	}
}
