import java.util.Scanner;

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

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