import java.util.Scanner;

public class Main {
	public static void main(String[] args) throws Exception {
		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);
	}
} import java.util.Scanner; Scanner java.util public class Main {
	public static void main(String[] args) throws Exception {
		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);
	}
} Main public static void main(String[] args) throws Exception {
		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);
	} 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);
	} 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 == 0) i % 3 i 3 0 !(i % 5 == 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) throws Exception {
		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);
	}
} public class Main {
	public static void main(String[] args) throws Exception {
		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);
	}
} Main
import java.util.Scanner;

public class Main {
	public static void main(String[] args) throws Exception {
		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);
	}
}
