import java.util.*;

class Main{
  public static void main(String[] args){
    try(Scanner sc = new Scanner(System.in)){
      int n = Integer.parseInt(sc.next());
      Integer[]d = new Integer[n];
      for(int i = 0; i < n; i++){
        d[i] = Integer.parseInt(sc.next());
      }
      
      Arrays.sort(d, Collections.reverseOrder());
      int cnt = 1; //初期値1
      for(int i = 0; i < n - 1; i++){
        if(d[i] > d[i + 1]){
          cnt++;
        }
      }
      System.out.println(cnt);
    }
  }
}
      
/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