import java.util.*;

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

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