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

public class Main {

	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		int N = sc.nextInt();
		int[] d = new int[N];
		for (int i = 0; i < N; i++) {
			d[i] = sc.nextInt();
		}
		Arrays.sort(d);
		int ans = 1;
		for (int i = N - 1; i > 0; i--) {
			if (d[i] > d[i - 1])
				ans++;
		}
		System.out.println(ans);
	}

} import java.util.Scanner; Scanner java.util import java.util.Arrays; Arrays java.util public class Main {

	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		int N = sc.nextInt();
		int[] d = new int[N];
		for (int i = 0; i < N; i++) {
			d[i] = sc.nextInt();
		}
		Arrays.sort(d);
		int ans = 1;
		for (int i = N - 1; i > 0; i--) {
			if (d[i] > d[i - 1])
				ans++;
		}
		System.out.println(ans);
	}

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

	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		int N = sc.nextInt();
		int[] d = new int[N];
		for (int i = 0; i < N; i++) {
			d[i] = sc.nextInt();
		}
		Arrays.sort(d);
		int ans = 1;
		for (int i = N - 1; i > 0; i--) {
			if (d[i] > d[i - 1])
				ans++;
		}
		System.out.println(ans);
	}

} public class Main {

	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		int N = sc.nextInt();
		int[] d = new int[N];
		for (int i = 0; i < N; i++) {
			d[i] = sc.nextInt();
		}
		Arrays.sort(d);
		int ans = 1;
		for (int i = N - 1; i > 0; i--) {
			if (d[i] > d[i - 1])
				ans++;
		}
		System.out.println(ans);
	}

} Main
import java.util.Scanner;
import java.util.Arrays;

public class Main {

	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		int N = sc.nextInt();
		int[] d = new int[N];
		for (int i = 0; i < N; i++) {
			d[i] = sc.nextInt();
		}
		Arrays.sort(d);
		int ans = 1;
		for (int i = N - 1; i > 0; i--) {
			if (d[i] > d[i - 1])
				ans++;
		}
		System.out.println(ans);
	}

}
