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

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

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

    sc.close();
  } main {
    Scanner sc = new Scanner(System.in);
    
    int n = sc.nextInt();
    int[] a = new int[n];
    for(int i=0; i<a.length; i++){
      a[i] = sc.nextInt();
    }
    Arrays.sort(a);
    int ans = 1;
    for(int i=0; i<n-1; i++){
      if(a[i] != a[i+1]){
        ans++;
      }
    }
    System.out.println(ans);

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

    sc.close();
  }
}