import java.util.*;
public class Main {
    public static void main(String[] args){
    
    Scanner sc = new Scanner(System.in);
    int N = sc.nextInt();
    int[]d = new int[N];

    for(int i=0; i<N; i++){
        d[i] = sc.nextInt();
}
    ArrayList<Integer>D = new ArrayList<>();    
    for(int i=0; i<N; i++){
        if(!D.contains(d[i])){
            D.add(d[i]);
        }    
    }
		System.out.println(D.size());
    }
}

/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