import java.util.*;

class Main {
    Scanner sc = new Scanner(System.in);

    public static void main(String[] args) {
        Main m = new Main();
        m.run();
    }

    private void run() {
        int n = sc.nextInt();
        long sum = 0;
        for (int i = 1; i <= n; i++) {
            if (i % 3 == 0 || i % 5 == 0) continue;
            sum += i;
        }
        System.out.println(sum);
    }
} import java.util.*; util.* java class Main {
    Scanner sc = new Scanner(System.in);

    public static void main(String[] args) {
        Main m = new Main();
        m.run();
    }

    private void run() {
        int n = sc.nextInt();
        long sum = 0;
        for (int i = 1; i <= n; i++) {
            if (i % 3 == 0 || i % 5 == 0) continue;
            sum += i;
        }
        System.out.println(sum);
    }
} Main Scanner sc = new Scanner(System.in); sc new Scanner(System.in) public static void main(String[] args) {
        Main m = new Main();
        m.run();
    } main {
        Main m = new Main();
        m.run();
    } Main m = new Main(); m new Main() m.run() m.run m String[] args args private void run() {
        int n = sc.nextInt();
        long sum = 0;
        for (int i = 1; i <= n; i++) {
            if (i % 3 == 0 || i % 5 == 0) continue;
            sum += i;
        }
        System.out.println(sum);
    } run {
        int n = sc.nextInt();
        long sum = 0;
        for (int i = 1; i <= n; i++) {
            if (i % 3 == 0 || i % 5 == 0) continue;
            sum += i;
        }
        System.out.println(sum);
    } int n = sc.nextInt(); n sc.nextInt() sc.nextInt sc long sum = 0; sum 0 for (int i = 1; i <= n; i++) {
            if (i % 3 == 0 || i % 5 == 0) continue;
            sum += i;
        } int i = 1; int i = 1; i 1 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; sum += i sum i System.out.println(sum) System.out.println System.out System System.out sum
import java.util.*;

class Main {
    Scanner sc = new Scanner(System.in);

    public static void main(String[] args) {
        Main m = new Main();
        m.run();
    }

    private void run() {
        int n = sc.nextInt();
        long sum = 0;
        for (int i = 1; i <= n; i++) {
            if (i % 3 == 0 || i % 5 == 0) continue;
            sum += i;
        }
        System.out.println(sum);
    }
}
