import java.util.*;
public class Main{
  public static void main(String[] args){
    Scanner sc = new Scanner(System.in);
    int num = Integer.parseInt(sc.next());
    int[] kagamiMochi = new int[num];
    int count = 1;
    for (int i = 0; i<num; i++){
      kagamiMochi[i] = Integer.parseInt(sc.next());
    }
    Arrays.sort(kagamiMochi);
    for(int j = num-2; j>=0; j--){
      if (kagamiMochi[j] != kagamiMochi[j+1]){
        count++;
      }
    }
    System.out.println(count);
  }
}

/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