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