package com.javarush.task.task04.task0424;

/*
Три числа
*/

import java.io.*;

public class Solution {
    public static void main(String[] args) throws Exception {
        //напишите тут ваш код
        BufferedReader reader = new BufferedReader(new InputStreamReader(System.in));

        String age = reader.readLine();
        int age0 = Integer.parseInt(age);
        String age1 = reader.readLine();
        int age2 = Integer.parseInt(age1);
        String age3 = reader.readLine();
        int age4 = Integer.parseInt(age3);

        if (age0 != age2 || age2 != age4) {
        }
        else if (age0 != age2 && age0 != age4) {
                System.out.println(1);
            }

        else if (age2 != age0 && age2 != age4) {
            System.out.println(2);
        }
        else if (age4 != age0 && age4 != age2) {
            System.out.println(3);
        }
    }
}