import java.util.Arrays;
import java.util.Scanner;

public class Main {
	public static void main(String[] args) {
		Scanner scan = new Scanner(System.in);
		int N = scan.nextInt();
		int []A = new int[N];
		for(int i = 0; i < N; i++) {
			A[i] = scan.nextInt();
		}
		scan.close();
		Arrays.sort(A);
		int cnt = 0;
		for(int i = 0; i < N - 2; i++) {
			int a1 = A[i];
			int a2 = A[i + 1];
			int a3 = A[i + 2];
			if(a1 != a2 && a2 != a3) {
				cnt ++;
			}
		}
		if(A[0] != A[1]) {
			cnt ++;
		}
		if(A[N - 2] != A[N - 1]) {
			cnt ++;
		}
		System.out.println(cnt);
	}
}