import java.util.*;
import java.io.*;

public class Main
{
	public static void main(String [] Args)
	{
		long ans=1;
		int flag=0;
		Scanner in = new Scanner(System.in);
		int n=in.nextInt();
		for(int i=0;i<n;i++)
		{
			long a=in.nextLong();
			if(a==0)
			{
				flag=-1;
				ans=ans*a;
				break;
			}			
			if(ans>(long)1e18/a)
			{
				flag=1;
			}
			ans=ans*a;
		}
		if(flag==1)
		{
			ans=-1;
		}
		System.out.println(ans);
	}
}
	
/tmp/hf-datasets-cache/medium/datasets/42704881117311-config-parquet-and-info-qiankunmu-Project_CodeNet-896c9d36/hub/datasets--qiankunmu--Project_CodeNet_Python800_and_Java250/snapshots/c899fde44a77ba1cc14973ed3de064e4ff3aadc7/Project_CodeNet_Java250.tar.gz