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

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

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