import 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 count = 1;
		for(int i=0; i<N-1; i++) {
			if(D[i]<D[i+1])count++;
		}
		System.out.println(count);
		sc.close();
	}

} import java.util.*; util.* java 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 count = 1;
		for(int i=0; i<N-1; i++) {
			if(D[i]<D[i+1])count++;
		}
		System.out.println(count);
		sc.close();
	}

} 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 count = 1;
		for(int i=0; i<N-1; i++) {
			if(D[i]<D[i+1])count++;
		}
		System.out.println(count);
		sc.close();
	} 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 count = 1;
		for(int i=0; i<N-1; i++) {
			if(D[i]<D[i+1])count++;
		}
		System.out.println(count);
		sc.close();
	} 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 count = 1; count 1 for(int i=0; i<N-1; i++) {
			if(D[i]<D[i+1])count++;
		} int i=0; int i=0; i 0 i<N-1 i N-1 N 1 i++ i++ i {
			if(D[i]<D[i+1])count++;
		} {
			if(D[i]<D[i+1])count++;
		} if(D[i]<D[i+1])count++; D[i]<D[i+1] D[i] D i D[i+1] D i+1 i 1 count++ count System.out.println(count) System.out.println System.out System System.out count sc.close() sc.close sc 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 count = 1;
		for(int i=0; i<N-1; i++) {
			if(D[i]<D[i+1])count++;
		}
		System.out.println(count);
		sc.close();
	}

} 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 count = 1;
		for(int i=0; i<N-1; i++) {
			if(D[i]<D[i+1])count++;
		}
		System.out.println(count);
		sc.close();
	}

} Main
import 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 count = 1;
		for(int i=0; i<N-1; i++) {
			if(D[i]<D[i+1])count++;
		}
		System.out.println(count);
		sc.close();
	}

}