import java.util.Scanner;
public class Main{
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		int n = sc.nextInt();
		int data[] = new int[n];
		int group[] = new int[101];
		int sum = 0;
		for(int i = 0; i < n; i++) {
			data[i] = sc.nextInt();
			group[data[i]]++;
		}
		for(int i = 0; i < 101; i++) {
			if(group[i]>0) {
				sum++;
			}
		}
		System.out.println(sum);
	}
} 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 data[] = new int[n];
		int group[] = new int[101];
		int sum = 0;
		for(int i = 0; i < n; i++) {
			data[i] = sc.nextInt();
			group[data[i]]++;
		}
		for(int i = 0; i < 101; i++) {
			if(group[i]>0) {
				sum++;
			}
		}
		System.out.println(sum);
	}
} Main public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		int n = sc.nextInt();
		int data[] = new int[n];
		int group[] = new int[101];
		int sum = 0;
		for(int i = 0; i < n; i++) {
			data[i] = sc.nextInt();
			group[data[i]]++;
		}
		for(int i = 0; i < 101; i++) {
			if(group[i]>0) {
				sum++;
			}
		}
		System.out.println(sum);
	} main {
		Scanner sc = new Scanner(System.in);
		int n = sc.nextInt();
		int data[] = new int[n];
		int group[] = new int[101];
		int sum = 0;
		for(int i = 0; i < n; i++) {
			data[i] = sc.nextInt();
			group[data[i]]++;
		}
		for(int i = 0; i < 101; i++) {
			if(group[i]>0) {
				sum++;
			}
		}
		System.out.println(sum);
	} Scanner sc = new Scanner(System.in); sc new Scanner(System.in) int n = sc.nextInt(); n sc.nextInt() sc.nextInt sc int data[] = new int[n]; data new int[n] n int group[] = new int[101]; group new int[101] 101 int sum = 0; sum 0 for(int i = 0; i < n; i++) {
			data[i] = sc.nextInt();
			group[data[i]]++;
		} int i = 0; int i = 0; i 0 i < n i n i++ i++ i {
			data[i] = sc.nextInt();
			group[data[i]]++;
		} {
			data[i] = sc.nextInt();
			group[data[i]]++;
		} data[i] = sc.nextInt() data[i] data i sc.nextInt() sc.nextInt sc group[data[i]]++ group[data[i]] group data[i] data i for(int i = 0; i < 101; i++) {
			if(group[i]>0) {
				sum++;
			}
		} int i = 0; int i = 0; i 0 i < 101 i 101 i++ i++ i {
			if(group[i]>0) {
				sum++;
			}
		} {
			if(group[i]>0) {
				sum++;
			}
		} if(group[i]>0) {
				sum++;
			} group[i]>0 group[i] group i 0 {
				sum++;
			} sum++ sum System.out.println(sum) System.out.println System.out System System.out sum String[] args args public class Main{
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		int n = sc.nextInt();
		int data[] = new int[n];
		int group[] = new int[101];
		int sum = 0;
		for(int i = 0; i < n; i++) {
			data[i] = sc.nextInt();
			group[data[i]]++;
		}
		for(int i = 0; i < 101; i++) {
			if(group[i]>0) {
				sum++;
			}
		}
		System.out.println(sum);
	}
} public class Main{
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		int n = sc.nextInt();
		int data[] = new int[n];
		int group[] = new int[101];
		int sum = 0;
		for(int i = 0; i < n; i++) {
			data[i] = sc.nextInt();
			group[data[i]]++;
		}
		for(int i = 0; i < 101; i++) {
			if(group[i]>0) {
				sum++;
			}
		}
		System.out.println(sum);
	}
} Main
import java.util.Scanner;
public class Main{
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		int n = sc.nextInt();
		int data[] = new int[n];
		int group[] = new int[101];
		int sum = 0;
		for(int i = 0; i < n; i++) {
			data[i] = sc.nextInt();
			group[data[i]]++;
		}
		for(int i = 0; i < 101; i++) {
			if(group[i]>0) {
				sum++;
			}
		}
		System.out.println(sum);
	}
}