import java.io.*;
import java.util.*;

public class Main{
    public static void main(String[]args)throws IOException{
        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));

        int mochis = Integer.parseInt(br.readLine());
        Set<Integer> mochi = new HashSet<Integer>();

        for(int i = 0; i<mochis; i++){
            mochi.add(Integer.parseInt(br.readLine()));
        }
        System.out.println(mochi.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