import java.util.*;
 
public class Main{
  public static void main(String[] args){
    Scanner sc = new Scanner(System.in);
    
    int N = sc.nextInt();
    long sum = 0;
    
    for(int i = 1; i <= N; i++){
      if(i%3 == 0)
        continue;
      if(i%5 == 0)
        continue;
      sum += i;
    }
    System.out.println(sum);
  }
} import java.util.*; util.* java public class Main{
  public static void main(String[] args){
    Scanner sc = new Scanner(System.in);
    
    int N = sc.nextInt();
    long sum = 0;
    
    for(int i = 1; i <= N; i++){
      if(i%3 == 0)
        continue;
      if(i%5 == 0)
        continue;
      sum += i;
    }
    System.out.println(sum);
  }
} Main public static void main(String[] args){
    Scanner sc = new Scanner(System.in);
    
    int N = sc.nextInt();
    long sum = 0;
    
    for(int i = 1; i <= N; i++){
      if(i%3 == 0)
        continue;
      if(i%5 == 0)
        continue;
      sum += i;
    }
    System.out.println(sum);
  } main {
    Scanner sc = new Scanner(System.in);
    
    int N = sc.nextInt();
    long sum = 0;
    
    for(int i = 1; i <= N; i++){
      if(i%3 == 0)
        continue;
      if(i%5 == 0)
        continue;
      sum += i;
    }
    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 long sum = 0; sum 0 for(int i = 1; i <= N; i++){
      if(i%3 == 0)
        continue;
      if(i%5 == 0)
        continue;
      sum += i;
    } int i = 1; int i = 1; i 1 i <= N i N i++ i++ i {
      if(i%3 == 0)
        continue;
      if(i%5 == 0)
        continue;
      sum += i;
    } {
      if(i%3 == 0)
        continue;
      if(i%5 == 0)
        continue;
      sum += i;
    } if(i%3 == 0)
        continue; i%3 == 0 i%3 i 3 0 continue; if(i%5 == 0)
        continue; i%5 == 0 i%5 i 5 0 continue; sum += i sum i 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();
    long sum = 0;
    
    for(int i = 1; i <= N; i++){
      if(i%3 == 0)
        continue;
      if(i%5 == 0)
        continue;
      sum += i;
    }
    System.out.println(sum);
  }
} public class Main{
  public static void main(String[] args){
    Scanner sc = new Scanner(System.in);
    
    int N = sc.nextInt();
    long sum = 0;
    
    for(int i = 1; i <= N; i++){
      if(i%3 == 0)
        continue;
      if(i%5 == 0)
        continue;
      sum += i;
    }
    System.out.println(sum);
  }
} Main
import java.util.*;
 
public class Main{
  public static void main(String[] args){
    Scanner sc = new Scanner(System.in);
    
    int N = sc.nextInt();
    long sum = 0;
    
    for(int i = 1; i <= N; i++){
      if(i%3 == 0)
        continue;
      if(i%5 == 0)
        continue;
      sum += i;
    }
    System.out.println(sum);
  }
}