import java.util.Scanner;

public class Main {

	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		int N = Integer.parseInt(sc.next());
		sc.close();

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

	}

} import java.util.Scanner; Scanner java.util public class Main {

	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		int N = Integer.parseInt(sc.next());
		sc.close();

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

	}

} Main public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		int N = Integer.parseInt(sc.next());
		sc.close();

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

	} main {
		Scanner sc = new Scanner(System.in);
		int N = Integer.parseInt(sc.next());
		sc.close();

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

	} Scanner sc = new Scanner(System.in); sc new Scanner(System.in) int N = Integer.parseInt(sc.next()); N Integer.parseInt(sc.next()) Integer.parseInt Integer sc.next() sc.next sc sc.close() sc.close sc 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.println(sum) System.out.println System.out System System.out sum String[] args args public class Main {

	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		int N = Integer.parseInt(sc.next());
		sc.close();

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

	}

} public class Main {

	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		int N = Integer.parseInt(sc.next());
		sc.close();

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

	}

} Main
import java.util.Scanner;

public class Main {

	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		int N = Integer.parseInt(sc.next());
		sc.close();

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

	}

}