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.math.BigDecimal;
import java.util.Scanner;
 
public class Main {
 
	public static void main(String[] args){
		Scanner sc = new Scanner(System.in);
		long N = sc.nextLong();
		BigDecimal ans = new BigDecimal(1);
		BigDecimal over = new BigDecimal(1000000000000000000L);
		boolean ov = false;
		boolean ze = false;
		for (int i = 0; i < N; i++) {
			long Ai = sc.nextLong();
			if (!ze) {
				if (Ai == 0) {
					ze = true;
				}
				if (!ov) {
					BigDecimal bd = new BigDecimal(Ai);
					ans = ans.multiply(bd);
					int ju = ans.compareTo(over);
					if (ju == 1) {
						ov = true;
					}
				}
			}
		}
		if (ze) {
			System.out.println(0);
		} else if (ov) {
			System.out.println(-1);
		} else {
			System.out.println(ans);
		}
	}
}