import java.util.*;
import java.util.stream.*;
 
public class Main {
  public static void main(String[] args){
    Scanner sc = new Scanner(System.in);
    int num = sc.nextInt();
    
    List<Integer> numList = new ArrayList<>();
    
    while(sc.hasNextInt()){
      numList.add(sc.nextInt());
    }
    
    numList = numList.stream().distinct().collect(Collectors.toList());
    
    System.out.println(numList.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