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.*;
 interface aisatu{
	final String str="こんにちは";
	void mesod();
}

public class Main {
	static public void main(String args[]){
		Scanner sc=new Scanner(System.in);
		
		int n=sc.nextInt();
		long aa=1L;
		for(int i=0;i<n;i++){
			long a=sc.nextLong();
			if(Math.log10(a)+Math.log10(aa)>18||
			aa*a>1000000000000000000L){
			   //1000000000000000000L
				aa=-1;
			}
			else if(a==0){
				aa*=0;
			}
			else if(aa!=-1){
				aa*=a;
			}
		}
		System.out.println(aa);
	}
}

