import java.util.Scanner;
public class Main{
    public static void main(String[] args){
        Scanner scan = new Scanner(System.in);
        long N = scan.nextInt();

        //List<String> NList = new ArrayList<String>();
        //int[] Narray = new int[N];
        long sum = 0;

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

        //List<String> NList = new ArrayList<String>();
        //int[] Narray = new int[N];
        long sum = 0;

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

        //List<String> NList = new ArrayList<String>();
        //int[] Narray = new int[N];
        long sum = 0;

        for(long i=0; i <= N ;i++){
            if(i%3 == 0 || i%5 == 0){
                continue;
            }
            sum += i;
        }
        System.out.println(sum);
    } main {
        Scanner scan = new Scanner(System.in);
        long N = scan.nextInt();

        //List<String> NList = new ArrayList<String>();
        //int[] Narray = new int[N];
        long sum = 0;

        for(long i=0; i <= N ;i++){
            if(i%3 == 0 || i%5 == 0){
                continue;
            }
            sum += i;
        }
        System.out.println(sum);
    } Scanner scan = new Scanner(System.in); scan new Scanner(System.in) long N = scan.nextInt(); N scan.nextInt() scan.nextInt scan long sum = 0; sum 0 for(long i=0; i <= N ;i++){
            if(i%3 == 0 || i%5 == 0){
                continue;
            }
            sum += i;
        } long i=0; long i=0; i 0 i <= N i N i++ i++ i {
            if(i%3 == 0 || i%5 == 0){
                continue;
            }
            sum += i;
        } {
            if(i%3 == 0 || i%5 == 0){
                continue;
            }
            sum += i;
        } if(i%3 == 0 || i%5 == 0){
                continue;
            } i%3 == 0 || i%5 == 0 i%3 == 0 i%3 i 3 0 i%5 == 0 i%5 i 5 0 {
                continue;
            } 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 scan = new Scanner(System.in);
        long N = scan.nextInt();

        //List<String> NList = new ArrayList<String>();
        //int[] Narray = new int[N];
        long sum = 0;

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

        //List<String> NList = new ArrayList<String>();
        //int[] Narray = new int[N];
        long sum = 0;

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

        //List<String> NList = new ArrayList<String>();
        //int[] Narray = new int[N];
        long sum = 0;

        for(long i=0; i <= N ;i++){
            if(i%3 == 0 || i%5 == 0){
                continue;
            }
            sum += i;
        }
        System.out.println(sum);
    }
}