import java.util.Scanner;

public class Main {

	public static void main(String[] args) {

		Scanner sc = new Scanner(System.in);

		int n = sc.nextInt();
		long sum = 0;

		for (int i = 1; i <= n; i++) {
			if (i % 3 != 0 && i % 5 != 0) {

				sum += i;
			}
		}

		System.out.println(sum);

		sc.close();

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

	public static void main(String[] args) {

		Scanner sc = new Scanner(System.in);

		int n = sc.nextInt();
		long sum = 0;

		for (int i = 1; i <= n; i++) {
			if (i % 3 != 0 && i % 5 != 0) {

				sum += i;
			}
		}

		System.out.println(sum);

		sc.close();

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

		Scanner sc = new Scanner(System.in);

		int n = sc.nextInt();
		long sum = 0;

		for (int i = 1; i <= n; i++) {
			if (i % 3 != 0 && i % 5 != 0) {

				sum += i;
			}
		}

		System.out.println(sum);

		sc.close();

	} main {

		Scanner sc = new Scanner(System.in);

		int n = sc.nextInt();
		long sum = 0;

		for (int i = 1; i <= n; i++) {
			if (i % 3 != 0 && i % 5 != 0) {

				sum += i;
			}
		}

		System.out.println(sum);

		sc.close();

	} Scanner sc = new Scanner(System.in); sc new Scanner(System.in) 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) {

				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 sc.close() sc.close sc String[] args args public class Main {

	public static void main(String[] args) {

		Scanner sc = new Scanner(System.in);

		int n = sc.nextInt();
		long sum = 0;

		for (int i = 1; i <= n; i++) {
			if (i % 3 != 0 && i % 5 != 0) {

				sum += i;
			}
		}

		System.out.println(sum);

		sc.close();

	}
} public class Main {

	public static void main(String[] args) {

		Scanner sc = new Scanner(System.in);

		int n = sc.nextInt();
		long sum = 0;

		for (int i = 1; i <= n; i++) {
			if (i % 3 != 0 && i % 5 != 0) {

				sum += i;
			}
		}

		System.out.println(sum);

		sc.close();

	}
} Main
import java.util.Scanner;

public class Main {

	public static void main(String[] args) {

		Scanner sc = new Scanner(System.in);

		int n = sc.nextInt();
		long sum = 0;

		for (int i = 1; i <= n; i++) {
			if (i % 3 != 0 && i % 5 != 0) {

				sum += i;
			}
		}

		System.out.println(sum);

		sc.close();

	}
}