import java.util.Scanner;
import java.util.Arrays;

public class Main {

    public static void main(String[] args) {
      Scanner scan = new Scanner(System.in);
      int n = scan.nextInt();
      int k[] = new int[n];

      for(int i=0;i<n;i++)
      k[i] = scan.nextInt();

      Arrays.sort(k);

      int count = 1;
      for(int i=0;i<n-1;i++){
        if(k[i]<k[i+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