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 = 0; i < N; i++) {
			if ((i + 1) % 3 != 0 && (i + 1) % 5 != 0) {
				sum += (i + 1);
			}
		}

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

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

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

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

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

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

		System.out.println(sum);
	}
}
