import java.util.*;

public class Main {

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

public class Main {

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