import java.util.*;
import java.lang.*;

public class Main {
    public static void main(String[] args) {

        Scanner s = new Scanner(System.in);

        int n =s.nextInt();
        long sum=0;

        for(int i=1;i<=n;i++){
            if(i%3!=0 && i%5!=0){
                sum=sum+i;
            }
        }

        System.out.println(sum);

    }
}



 import java.util.*; util.* java import java.lang.*; lang.* java public class Main {
    public static void main(String[] args) {

        Scanner s = new Scanner(System.in);

        int n =s.nextInt();
        long sum=0;

        for(int i=1;i<=n;i++){
            if(i%3!=0 && i%5!=0){
                sum=sum+i;
            }
        }

        System.out.println(sum);

    }
} Main public static void main(String[] args) {

        Scanner s = new Scanner(System.in);

        int n =s.nextInt();
        long sum=0;

        for(int i=1;i<=n;i++){
            if(i%3!=0 && i%5!=0){
                sum=sum+i;
            }
        }

        System.out.println(sum);

    } main {

        Scanner s = new Scanner(System.in);

        int n =s.nextInt();
        long sum=0;

        for(int i=1;i<=n;i++){
            if(i%3!=0 && i%5!=0){
                sum=sum+i;
            }
        }

        System.out.println(sum);

    } Scanner s = new Scanner(System.in); s new Scanner(System.in) int n =s.nextInt(); n s.nextInt() s.nextInt s long sum=0; sum 0 for(int i=1;i<=n;i++){
            if(i%3!=0 && i%5!=0){
                sum=sum+i;
            }
        } int i=1; int i=1; i 1 i<=n i n 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%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 s = new Scanner(System.in);

        int n =s.nextInt();
        long sum=0;

        for(int i=1;i<=n;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 s = new Scanner(System.in);

        int n =s.nextInt();
        long sum=0;

        for(int i=1;i<=n;i++){
            if(i%3!=0 && i%5!=0){
                sum=sum+i;
            }
        }

        System.out.println(sum);

    }
} Main
import java.util.*;
import java.lang.*;

public class Main {
    public static void main(String[] args) {

        Scanner s = new Scanner(System.in);

        int n =s.nextInt();
        long sum=0;

        for(int i=1;i<=n;i++){
            if(i%3!=0 && i%5!=0){
                sum=sum+i;
            }
        }

        System.out.println(sum);

    }
}




