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) {

		Scanner scanner=new Scanner(System.in);
		int N = scanner.nextInt();
		long ans = 1;
		long max = (long)Math.pow(10, 18);

		for(int i = 0 ; i < N ; i++) {
			long a = scanner.nextLong();
			if(a == 0) {
				ans = 0;
				break;
			}
			if(max / ans >= a) {
				ans *= a;
			}else {
				ans = -1;
			}

		}

		System.out.println(ans);

		scanner.close();

	}

}
