import java.util.LinkedList;

import java.util.List;

import java.util.Scanner;

public class Main<E>{    

    List<E> l = new LinkedList<>();//成员变量

    public void push(E i){

        l.add(i);

    }

    public E pop(){

        return ((LinkedList<E>) l).removeLast();

    }

    public boolean isempty(){

        if(l.isEmpty()==true){

            return true;

        }return false;

    }

    public int size(){

        return l.size();

    }

    public void clear(){

        l.clear();

    }

public static void main(String[] args) {

    Main<String> m = new Main<>();

    Scanner sc = new Scanner(System.in);

    for(int i=0;i<5;i++){

        m.push(sc.next());

    }

    m.clear();

    System.out.println(m.size());

}

}