import java.util.Scanner;

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

        boolean enable=false;
        Scanner sc=new Scanner(System.in);
        long l=sc.nextLong();
        long sum=0;
        for(long i=1;i<=l;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){

        boolean enable=false;
        Scanner sc=new Scanner(System.in);
        long l=sc.nextLong();
        long sum=0;
        for(long i=1;i<=l;i++){
            if(i%3 ==0 || i%5==0){
                continue;
            }
            sum +=i;
        }
        System.out.println(sum);
    }

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

        boolean enable=false;
        Scanner sc=new Scanner(System.in);
        long l=sc.nextLong();
        long sum=0;
        for(long i=1;i<=l;i++){
            if(i%3 ==0 || i%5==0){
                continue;
            }
            sum +=i;
        }
        System.out.println(sum);
    } main {

        boolean enable=false;
        Scanner sc=new Scanner(System.in);
        long l=sc.nextLong();
        long sum=0;
        for(long i=1;i<=l;i++){
            if(i%3 ==0 || i%5==0){
                continue;
            }
            sum +=i;
        }
        System.out.println(sum);
    } boolean enable=false; enable false Scanner sc=new Scanner(System.in); sc new Scanner(System.in) long l=sc.nextLong(); l sc.nextLong() sc.nextLong sc long sum=0; sum 0 for(long i=1;i<=l;i++){
            if(i%3 ==0 || i%5==0){
                continue;
            }
            sum +=i;
        } long i=1; long i=1; i 1 i<=l i l 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){

        boolean enable=false;
        Scanner sc=new Scanner(System.in);
        long l=sc.nextLong();
        long sum=0;
        for(long i=1;i<=l;i++){
            if(i%3 ==0 || i%5==0){
                continue;
            }
            sum +=i;
        }
        System.out.println(sum);
    }

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

        boolean enable=false;
        Scanner sc=new Scanner(System.in);
        long l=sc.nextLong();
        long sum=0;
        for(long i=1;i<=l;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){

        boolean enable=false;
        Scanner sc=new Scanner(System.in);
        long l=sc.nextLong();
        long sum=0;
        for(long i=1;i<=l;i++){
            if(i%3 ==0 || i%5==0){
                continue;
            }
            sum +=i;
        }
        System.out.println(sum);
    }

}