import java.util.*;

class Main{
    public static void main(String[] args){
        Scanner sc = new Scanner(System.in);
        int num = sc.nextInt();
        int[] moti = new int[num];
        int ans = 1;
        for(int i = 0;i < num;i++){
            moti[i] = sc.nextInt();
        }
        Arrays.sort(moti);
        for(int i = 0;i < num-1;i++){
            if(moti[i] == moti[i+1])
            continue;
            ans++;
        }

        System.out.println(ans);
    }
}
/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