import java.util.*;

class Main{
    public static void main(String[] args){
        Scanner sc = new Scanner(System.in);

        int n = sc.nextInt();
        Integer[] list = new Integer[n];

        for(int i = 0; i < n; i++){
            list[i] = sc.nextInt();
        }

        Arrays.sort(list);
        
        int t = list[0];
        int ans = 1;

        for(int i = 1; i < n; i++){
            if(list[i] != t){
                t = list[i];
                ans++;
            }
        }

        System.out.println(ans);

        sc.close();
    }
}
/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