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.print(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[] 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.print(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 = 1;
        for(int i = 0; i < n-1; i++){
            if(d[i] < d[i+1]){
                count++;
            }
        }
        System.out.print(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 = 1;
        for(int i = 0; i < n-1; i++){
            if(d[i] < d[i+1]){
                count++;
            }
        }
        System.out.print(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] = 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++ count System.out.print(count) System.out.print 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 = 1;
        for(int i = 0; i < n-1; i++){
            if(d[i] < d[i+1]){
                count++;
            }
        }
        System.out.print(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 = 1;
        for(int i = 0; i < n-1; i++){
            if(d[i] < d[i+1]){
                count++;
            }
        }
        System.out.print(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[] 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.print(count);
    }
}