import java.util.ArrayList;
import java.util.Scanner;

public class Main{

    public static void main(String[] args) {
        
        Scanner scan = new Scanner(System.in);
        
        int n = scan.nextInt();
        ArrayList<Integer> list = new ArrayList<>();
        for(int i=0; i<n; i++){
            int d = scan.nextInt();
            if(!list.contains(d)) list.add(d);
        }
        System.out.println(list.size());
        scan.close();
        
    }
}
/tmp/hf-datasets-cache/medium/datasets/42704881117311-config-parquet-and-info-qiankunmu-Project_CodeNet-896c9d36/hub/datasets--qiankunmu--Project_CodeNet_Python800_and_Java250/snapshots/c899fde44a77ba1cc14973ed3de064e4ff3aadc7/Project_CodeNet_Java250.tar.gz