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 ans = 1;
    for(int i = 1; i < n; i++){
      if(d[i-1] != d[i]){
        ans++;
      }
    }
   
    System.out.println(ans);
    
  }
} 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 ans = 1;
    for(int i = 1; i < n; i++){
      if(d[i-1] != d[i]){
        ans++;
      }
    }
   
    System.out.println(ans);
    
  }
} 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 ans = 1;
    for(int i = 1; i < n; i++){
      if(d[i-1] != d[i]){
        ans++;
      }
    }
   
    System.out.println(ans);
    
  } 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 ans = 1;
    for(int i = 1; i < n; i++){
      if(d[i-1] != d[i]){
        ans++;
      }
    }
   
    System.out.println(ans);
    
  } 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 ans = 1; ans 1 for(int i = 1; i < n; i++){
      if(d[i-1] != d[i]){
        ans++;
      }
    } int i = 1; int i = 1; i 1 i < n i n i++ i++ i {
      if(d[i-1] != d[i]){
        ans++;
      }
    } {
      if(d[i-1] != d[i]){
        ans++;
      }
    } if(d[i-1] != d[i]){
        ans++;
      } d[i-1] != d[i] d[i-1] d i-1 i 1 d[i] d i {
        ans++;
      } ans++ ans System.out.println(ans) System.out.println System.out System System.out ans 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 ans = 1;
    for(int i = 1; i < n; i++){
      if(d[i-1] != d[i]){
        ans++;
      }
    }
   
    System.out.println(ans);
    
  }
} 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 ans = 1;
    for(int i = 1; i < n; i++){
      if(d[i-1] != d[i]){
        ans++;
      }
    }
   
    System.out.println(ans);
    
  }
} 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 ans = 1;
    for(int i = 1; i < n; i++){
      if(d[i-1] != d[i]){
        ans++;
      }
    }
   
    System.out.println(ans);
    
  }
}