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.*;
import java.math.*;
public class Main {
	public static void main(String[] args) {
		Scanner in = new Scanner(System.in);
		int n = in.nextInt();
		long ans = 1;
		long prev = 1;
		boolean flag = true;
		boolean zero = false;
		long[] mult = new long[n];
		long check = 1000000000000000000L;
		for(int i = 0; i < n; i++) {
			mult[i] = in.nextLong();
			if(mult[i] == 0L) zero = true;
		}
		if(zero == true) {
			System.out.println("0");
		}else {
			for(int i = 0; i < n; i++) {
				long cur = mult[i];
				if((check / cur) < ans) flag = false;
				ans *= cur;
			}
			if(flag == true) {
				System.out.println(ans);
			}else {
				System.out.println("-1");
			}
		}
	}
}