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) {
		// TODO 自動生成されたメソッド・スタブ

		Scanner scan = new java.util.Scanner(System.in);

		int n = scan.nextInt();
		long[] a = new long[n];


		for(int i=0;i<n;i++) {

			 a[i] = scan.nextLong();
			 if(a[i]==0) {
				 System.out.println(0);
				 return;
			 }
		}

long c =1;
for(int i=0;i<n;i++) {
	if(a[i] <= 1000000000000000000L / c)
		c *= a[i];
	else {
		System.out.println(-1);
		return;
	}
}

if(c > 1000000000000000000L)
			System.out.println(-1);
else
	System.out.println(c);

	scan.close();

	}

}
