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 sc=new Scanner(System.in);
		int n=sc.nextInt();
		long a[]=new long[n];
		long ans=1;
		long x=(long)(Math.pow(10, 18));
		for(int i=0;i<n;i++) {
			a[i]=sc.nextLong();
			if(a[i]==0) {
				ans=0;
			}
			if(a[i]>x) {
				ans=-1;
			}
		}
		if(ans!=0&&ans!=-1) {
				for(int i=0;i<n;i++) {
					if(Math.log10(ans)+Math.log10(a[i])<18.5) {
					ans*=a[i];
					if(ans>x) {
						ans=-1;
						break;
					}
					}
					else {
						if(Math.log(ans)+Math.log10(a[i])>18) {
							ans=-1;
							break;
						}
					}
			}
		}
				System.out.println(ans);
	}
}
