adGunleri

import java.util.Scanner;

public class Main {

    public static void main(String[] args) {
        Scanner scan = new Scanner(System.in);

        int adGunuSayi = scan.nextInt();
        int arr[] = new int[adGunuSayi];
        int count = 0;
        boolean unique = true;

        for (int i = 0; i < arr.length; i++){
            arr[i] = scan.nextInt();
            for (int j = 0; j<i; j++){
                if (arr[i] == arr[j]){
                    unique = false;
                    break;
                }
                else{
                    unique = true;
                }
            }
            if (unique){
                count++;
            }
        }

        System.out.println(count);
    }

}