import java.util.Scanner;

class Main {
    public static void main(String[] args){
        Scanner stdIn = new Scanner(System.in);
        int N = stdIn.nextInt();

        long sum = 0;

        for(int i = 1; i<=N; i++){
            if(i%3 != 0 && i%5 != 0){
                sum+=i;
            }
        }
        System.out.print(sum);
    }
} import java.util.Scanner; Scanner java.util class Main {
    public static void main(String[] args){
        Scanner stdIn = new Scanner(System.in);
        int N = stdIn.nextInt();

        long sum = 0;

        for(int i = 1; i<=N; i++){
            if(i%3 != 0 && i%5 != 0){
                sum+=i;
            }
        }
        System.out.print(sum);
    }
} Main public static void main(String[] args){
        Scanner stdIn = new Scanner(System.in);
        int N = stdIn.nextInt();

        long sum = 0;

        for(int i = 1; i<=N; i++){
            if(i%3 != 0 && i%5 != 0){
                sum+=i;
            }
        }
        System.out.print(sum);
    } main {
        Scanner stdIn = new Scanner(System.in);
        int N = stdIn.nextInt();

        long sum = 0;

        for(int i = 1; i<=N; i++){
            if(i%3 != 0 && i%5 != 0){
                sum+=i;
            }
        }
        System.out.print(sum);
    } Scanner stdIn = new Scanner(System.in); stdIn new Scanner(System.in) int N = stdIn.nextInt(); N stdIn.nextInt() stdIn.nextInt stdIn long sum = 0; sum 0 for(int i = 1; i<=N; i++){
            if(i%3 != 0 && i%5 != 0){
                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+=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.print(sum) System.out.print System.out System System.out sum String[] args args
import java.util.Scanner;

class Main {
    public static void main(String[] args){
        Scanner stdIn = new Scanner(System.in);
        int N = stdIn.nextInt();

        long sum = 0;

        for(int i = 1; i<=N; i++){
            if(i%3 != 0 && i%5 != 0){
                sum+=i;
            }
        }
        System.out.print(sum);
    }
}