import java.util.Scanner;

public class Main {

    public static void main(String[] args) {
        final Scanner sc = new Scanner(System.in);

        final int n = sc.nextInt();

        long ans = 0;

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

        System.out.println(ans);
    }
} import java.util.Scanner; Scanner java.util public class Main {

    public static void main(String[] args) {
        final Scanner sc = new Scanner(System.in);

        final int n = sc.nextInt();

        long ans = 0;

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

        System.out.println(ans);
    }
} Main public static void main(String[] args) {
        final Scanner sc = new Scanner(System.in);

        final int n = sc.nextInt();

        long ans = 0;

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

        System.out.println(ans);
    } main {
        final Scanner sc = new Scanner(System.in);

        final int n = sc.nextInt();

        long ans = 0;

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

        System.out.println(ans);
    } final Scanner sc = new Scanner(System.in); sc new Scanner(System.in) final int n = sc.nextInt(); n sc.nextInt() sc.nextInt sc long ans = 0; ans 0 for (int i = 0; i <= n; i++) {
            if (i % 3 != 0 && i % 5 != 0) ans += i;
        } int i = 0; int i = 0; i 0 i <= n i n i++ i++ i {
            if (i % 3 != 0 && i % 5 != 0) ans += i;
        } {
            if (i % 3 != 0 && i % 5 != 0) ans += i;
        } if (i % 3 != 0 && i % 5 != 0) ans += i; i % 3 != 0 && i % 5 != 0 i % 3 != 0 i % 3 i 3 0 i % 5 != 0 i % 5 i 5 0 ans += i ans i System.out.println(ans) System.out.println System.out System System.out ans String[] args args public class Main {

    public static void main(String[] args) {
        final Scanner sc = new Scanner(System.in);

        final int n = sc.nextInt();

        long ans = 0;

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

        System.out.println(ans);
    }
} public class Main {

    public static void main(String[] args) {
        final Scanner sc = new Scanner(System.in);

        final int n = sc.nextInt();

        long ans = 0;

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

        System.out.println(ans);
    }
} Main
import java.util.Scanner;

public class Main {

    public static void main(String[] args) {
        final Scanner sc = new Scanner(System.in);

        final int n = sc.nextInt();

        long ans = 0;

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

        System.out.println(ans);
    }
}
