import java.util.ArrayList;
import java.util.Comparator;
import java.util.List;
import java.util.Scanner;

class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        int N = Integer.parseInt(sc.next());
        List<Integer> numList = new ArrayList<>();
        for (int i = 0; i < N; i++) {
            numList.add(Integer.parseInt(sc.next()));
        }
        numList.sort(Comparator.reverseOrder());
        int preNum = 0;
        List<Integer> removeList = new ArrayList<>();
        for (int i = 0; i < numList.size(); i++) {
            int n = numList.get(i).intValue();
            if (n == preNum) {
                removeList.add(i);
            } else {
                preNum = n;
            }
        }
        removeList.sort(Comparator.reverseOrder());
        for (Integer i:
             removeList) {
            numList.remove(i.intValue());
        }
        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