import java.util.Scanner;
public class Main {
	public static void main(String[] args){

		Scanner sc = new Scanner(System.in);

		int A = sc.nextInt();

		long sum = 0;

		for(int i = 1; i <= A; i++){
			if(i % 3 == 0 || i % 5 == 0){
			} else {
				sum += i;
			}
		}

		System.out.print(sum);

	return;

	}
} import java.util.Scanner; Scanner java.util public class Main {
	public static void main(String[] args){

		Scanner sc = new Scanner(System.in);

		int A = sc.nextInt();

		long sum = 0;

		for(int i = 1; i <= A; i++){
			if(i % 3 == 0 || i % 5 == 0){
			} else {
				sum += i;
			}
		}

		System.out.print(sum);

	return;

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

		Scanner sc = new Scanner(System.in);

		int A = sc.nextInt();

		long sum = 0;

		for(int i = 1; i <= A; i++){
			if(i % 3 == 0 || i % 5 == 0){
			} else {
				sum += i;
			}
		}

		System.out.print(sum);

	return;

	} main {

		Scanner sc = new Scanner(System.in);

		int A = sc.nextInt();

		long sum = 0;

		for(int i = 1; i <= A; i++){
			if(i % 3 == 0 || i % 5 == 0){
			} else {
				sum += i;
			}
		}

		System.out.print(sum);

	return;

	} Scanner sc = new Scanner(System.in); sc new Scanner(System.in) int A = sc.nextInt(); A sc.nextInt() sc.nextInt sc long sum = 0; sum 0 for(int i = 1; i <= A; i++){
			if(i % 3 == 0 || i % 5 == 0){
			} else {
				sum += i;
			}
		} int i = 1; int i = 1; i 1 i <= A i A i++ i++ i {
			if(i % 3 == 0 || i % 5 == 0){
			} else {
				sum += i;
			}
		} {
			if(i % 3 == 0 || i % 5 == 0){
			} else {
				sum += i;
			}
		} if(i % 3 == 0 || i % 5 == 0){
			} else {
				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.print(sum) System.out.print System.out System System.out sum return; String[] args args public class Main {
	public static void main(String[] args){

		Scanner sc = new Scanner(System.in);

		int A = sc.nextInt();

		long sum = 0;

		for(int i = 1; i <= A; i++){
			if(i % 3 == 0 || i % 5 == 0){
			} else {
				sum += i;
			}
		}

		System.out.print(sum);

	return;

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

		Scanner sc = new Scanner(System.in);

		int A = sc.nextInt();

		long sum = 0;

		for(int i = 1; i <= A; i++){
			if(i % 3 == 0 || i % 5 == 0){
			} else {
				sum += i;
			}
		}

		System.out.print(sum);

	return;

	}
} Main
import java.util.Scanner;
public class Main {
	public static void main(String[] args){

		Scanner sc = new Scanner(System.in);

		int A = sc.nextInt();

		long sum = 0;

		for(int i = 1; i <= A; i++){
			if(i % 3 == 0 || i % 5 == 0){
			} else {
				sum += i;
			}
		}

		System.out.print(sum);

	return;

	}
}
