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.BigInteger;
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];
			BigInteger ret = BigInteger.ONE;
			String x1 = "1000000000000000000";
			BigInteger x = new BigInteger(x1) ;
			
			for(int i=0;i<n;i++) {
				a[i] = sc.nextLong();
				if(a[i]==0) {
					System.out.println(0);
					return;
				}
			}
			
			for(int i=0;i<n;i++) {
				ret = ret.multiply(BigInteger.valueOf(a[i]));
				if(ret.compareTo(x)==1) {
					System.out.println(-1);
					return;
				}
			}
			
			
			System.out.println(ret);
		}
		
	}
