import java.util.Scanner;
public class Solution
{
    public static void main(String[]args)
    {
        Scanner sc = new Scanner(System.in);
        try
        {
            int n = sc.nextInt();
            
            long product = 1;
            for(int i =0;i<n;i++)
            {
              int num = sc.nextInt();
                product *= num;
            }
            System.out.println(product);
        }
        catch(InputMismatchException e)
        {
            System.out.println("Invalid input");
        }
    }
}