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[] d = new int[n];
		for(int i=0;i<n;i++)d[i]=sc.nextInt();
		Arrays.sort(d);
		int count=0;
		for(int i=0;i<n;i++) {
			if(i==0) {
				count++;
			}else {
				if(d[i] != d[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[] d = new int[n];
		for(int i=0;i<n;i++)d[i]=sc.nextInt();
		Arrays.sort(d);
		int count=0;
		for(int i=0;i<n;i++) {
			if(i==0) {
				count++;
			}else {
				if(d[i] != d[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[] d = new int[n];
		for(int i=0;i<n;i++)d[i]=sc.nextInt();
		Arrays.sort(d);
		int count=0;
		for(int i=0;i<n;i++) {
			if(i==0) {
				count++;
			}else {
				if(d[i] != d[i-1]) {
					count++;
				}
			}
		}
		System.out.println(count);
	} 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=0;
		for(int i=0;i<n;i++) {
			if(i==0) {
				count++;
			}else {
				if(d[i] != d[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[] 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] d i sc.nextInt() sc.nextInt sc Arrays.sort(d) Arrays.sort Arrays d int count=0; count 0 for(int i=0;i<n;i++) {
			if(i==0) {
				count++;
			}else {
				if(d[i] != d[i-1]) {
					count++;
				}
			}
		} int i=0; int i=0; i 0 i<n i n i++ i++ i {
			if(i==0) {
				count++;
			}else {
				if(d[i] != d[i-1]) {
					count++;
				}
			}
		} {
			if(i==0) {
				count++;
			}else {
				if(d[i] != d[i-1]) {
					count++;
				}
			}
		} if(i==0) {
				count++;
			}else {
				if(d[i] != d[i-1]) {
					count++;
				}
			} i==0 i 0 {
				count++;
			} count++ 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++ 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[] d = new int[n];
		for(int i=0;i<n;i++)d[i]=sc.nextInt();
		Arrays.sort(d);
		int count=0;
		for(int i=0;i<n;i++) {
			if(i==0) {
				count++;
			}else {
				if(d[i] != d[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[] d = new int[n];
		for(int i=0;i<n;i++)d[i]=sc.nextInt();
		Arrays.sort(d);
		int count=0;
		for(int i=0;i<n;i++) {
			if(i==0) {
				count++;
			}else {
				if(d[i] != d[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[] d = new int[n];
		for(int i=0;i<n;i++)d[i]=sc.nextInt();
		Arrays.sort(d);
		int count=0;
		for(int i=0;i<n;i++) {
			if(i==0) {
				count++;
			}else {
				if(d[i] != d[i-1]) {
					count++;
				}
			}
		}
		System.out.println(count);
	}
}
