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 answer =1;
    for(int i=0;i<N-1;i++){
      if(d[i]!=d[i+1]){
        answer=answer+1;
      }
    }
    System.out.println(answer);
  }
  

  
} 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 answer =1;
    for(int i=0;i<N-1;i++){
      if(d[i]!=d[i+1]){
        answer=answer+1;
      }
    }
    System.out.println(answer);
  }
  

  
} 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 answer =1;
    for(int i=0;i<N-1;i++){
      if(d[i]!=d[i+1]){
        answer=answer+1;
      }
    }
    System.out.println(answer);
  } 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 answer =1;
    for(int i=0;i<N-1;i++){
      if(d[i]!=d[i+1]){
        answer=answer+1;
      }
    }
    System.out.println(answer);
  } 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 answer =1; answer 1 for(int i=0;i<N-1;i++){
      if(d[i]!=d[i+1]){
        answer=answer+1;
      }
    } 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]){
        answer=answer+1;
      }
    } {
      if(d[i]!=d[i+1]){
        answer=answer+1;
      }
    } if(d[i]!=d[i+1]){
        answer=answer+1;
      } d[i]!=d[i+1] d[i] d i d[i+1] d i+1 i 1 {
        answer=answer+1;
      } answer=answer+1 answer answer+1 answer 1 System.out.println(answer) System.out.println System.out System System.out answer 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 answer =1;
    for(int i=0;i<N-1;i++){
      if(d[i]!=d[i+1]){
        answer=answer+1;
      }
    }
    System.out.println(answer);
  }
  

  
} 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 answer =1;
    for(int i=0;i<N-1;i++){
      if(d[i]!=d[i+1]){
        answer=answer+1;
      }
    }
    System.out.println(answer);
  }
  

  
} 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 answer =1;
    for(int i=0;i<N-1;i++){
      if(d[i]!=d[i+1]){
        answer=answer+1;
      }
    }
    System.out.println(answer);
  }
  

  
}