import java.util.Scanner;
public class profit{
    public static void main(String args[]){
        Scanner sc=new Scanner(System.in);
            int n=sc.nextInt();
            int arr[]=new int[n];
            int product=1;
            for(int i=0;i<n;i++)
{
    if(!sc.hasNextInt()){
        System.out.println("Invalid input");
        sc.close;
        return;
    }
    arr[i]=sc.nextInt();
    product*=arr[i];
    
}        
System.out.println(product);
    }
}