package m.shin;
import java.util.Scanner;
import java.util.TreeSet;
public class Con182 {

	public static void main(String[] args) {
		Scanner s = new Scanner(System.in);
		int N = s.nextInt();
		TreeSet<Integer> a = new TreeSet<>();
		TreeSet<Integer> b = new TreeSet<>();
		for(int i = 0;i < N;i++){
			int t = s.nextInt();
			if(a.contains(t)){
				b.add(t);
			}
			a.add(t);
		}
		s.close();
		System.out.println((a.size() - b.size()));
	}

}