import java.util.*;
class Main{

     public static void main(String []args){
      Scanner scan = new Scanner(System.in);
      int m = scan.nextInt() ;
      int arr[] = new int[m] ;
      ArrayList<Integer> a = new ArrayList<>() ;
      for(int i =0 ;i<m ; i++){
          arr[i] = scan.nextInt() ;
          if(!a.contains(arr[i])){
              a.add(arr[i]) ;
          }
      }
      System.out.println(a.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