import java.util.HashSet;

import java.util.Scanner;

import java.util.Set;

public class Main2 {

public static void main(String[] args) {

Set<Integer> set = new HashSet<>();

Scanner scanner = new Scanner(System.in);

while(true){

int num = scanner.nextInt();

if(num<=0)

break;

set.add(num);

}

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

}

}