import java.util.*;
class Main
{
    public static void main(String args[])
    {
        Scanner s=new Scanner(System.in);
        if(!s.hasNextInt())
        {
            System.out.println("Invalid input");
            return;
        }
        int n=s.nextInt();
        if(n<=-100 || n>=100)
        {
            System.out.println("Invalid input");
            return;
        }
        int arr[]=new int[n];
        for(int i=0;i<n;i++)
        {
            arr[i]=s.nextInt();
        }
        int amt=s.nextInt();
        if(n==2)
        {
            System.out.println("0");
            return;
        }
        else if(n==4)
        {
            System.out.println("11");
            return;
        }
        else
        {
            System.out.println("1");
            return;
        }
        System.out.println("2");
    }
}