import java.util.*;
public class Main{public static void main(String[]args){
Scanner sc=new Scanner(System.in);
  int n=sc.nextInt();
  ArrayList<Integer>po=new ArrayList<>();
  for(int i=0;i<n;i++)po.add(sc.nextInt());
  for(int i=0;i<po.size()-1;i++){
  for(int j=i+1;j<po.size();j++){
  if(po.get(i).equals(po.get(j))){po.remove(j);j--;}
  }
  }
  System.out.println(po.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