
import java.util.Scanner;

public class Main {

	static Scanner scanner;

	public static void main(String[] args) {
	    scanner = new Scanner(System.in);

        int N=gi();
        long s=0;
        for (int i=1; i<=N;i++) {
        	if(i%3!=0 && i%5!=0) {
        		s+=i;
        	}
        }

        System.out.println(s);
	}


	public static long d(long n) {
		String a=String.valueOf(n);
		return (long)a.length();
	}

	// 文字列として入力を取得
	public static String gs() {
		return scanner.next();
	}

	// intとして入力を取得
	public static int gi() {
		return Integer.parseInt(scanner.next());
	}

	// longとして入力を取得
	public static long gl() {
		return Long.parseLong(scanner.next());
	}

	// doubleとして入力を取得
	public static double gd() {
		return Double.parseDouble(scanner.next());
	}
} import java.util.Scanner; Scanner java.util public class Main {

	static Scanner scanner;

	public static void main(String[] args) {
	    scanner = new Scanner(System.in);

        int N=gi();
        long s=0;
        for (int i=1; i<=N;i++) {
        	if(i%3!=0 && i%5!=0) {
        		s+=i;
        	}
        }

        System.out.println(s);
	}


	public static long d(long n) {
		String a=String.valueOf(n);
		return (long)a.length();
	}

	// 文字列として入力を取得
	public static String gs() {
		return scanner.next();
	}

	// intとして入力を取得
	public static int gi() {
		return Integer.parseInt(scanner.next());
	}

	// longとして入力を取得
	public static long gl() {
		return Long.parseLong(scanner.next());
	}

	// doubleとして入力を取得
	public static double gd() {
		return Double.parseDouble(scanner.next());
	}
} Main static Scanner scanner; scanner public static void main(String[] args) {
	    scanner = new Scanner(System.in);

        int N=gi();
        long s=0;
        for (int i=1; i<=N;i++) {
        	if(i%3!=0 && i%5!=0) {
        		s+=i;
        	}
        }

        System.out.println(s);
	} main {
	    scanner = new Scanner(System.in);

        int N=gi();
        long s=0;
        for (int i=1; i<=N;i++) {
        	if(i%3!=0 && i%5!=0) {
        		s+=i;
        	}
        }

        System.out.println(s);
	} scanner = new Scanner(System.in) scanner new Scanner(System.in) int N=gi(); N gi() gi long s=0; s 0 for (int i=1; i<=N;i++) {
        	if(i%3!=0 && i%5!=0) {
        		s+=i;
        	}
        } int i=1; int i=1; i 1 i<=N i N i++ i++ i {
        	if(i%3!=0 && i%5!=0) {
        		s+=i;
        	}
        } {
        	if(i%3!=0 && i%5!=0) {
        		s+=i;
        	}
        } if(i%3!=0 && i%5!=0) {
        		s+=i;
        	} i%3!=0 && i%5!=0 i%3!=0 i%3 i 3 0 i%5!=0 i%5 i 5 0 {
        		s+=i;
        	} s+=i s i System.out.println(s) System.out.println System.out System System.out s String[] args args public static long d(long n) {
		String a=String.valueOf(n);
		return (long)a.length();
	} d {
		String a=String.valueOf(n);
		return (long)a.length();
	} String a=String.valueOf(n); a String.valueOf(n) String.valueOf String n return (long)a.length(); (long)a.length() a.length a long n n // 文字列として入力を取得
	public static String gs() {
		return scanner.next();
	} gs {
		return scanner.next();
	} return scanner.next(); scanner.next() scanner.next scanner // intとして入力を取得
	public static int gi() {
		return Integer.parseInt(scanner.next());
	} gi {
		return Integer.parseInt(scanner.next());
	} return Integer.parseInt(scanner.next()); Integer.parseInt(scanner.next()) Integer.parseInt Integer scanner.next() scanner.next scanner // longとして入力を取得
	public static long gl() {
		return Long.parseLong(scanner.next());
	} gl {
		return Long.parseLong(scanner.next());
	} return Long.parseLong(scanner.next()); Long.parseLong(scanner.next()) Long.parseLong Long scanner.next() scanner.next scanner // doubleとして入力を取得
	public static double gd() {
		return Double.parseDouble(scanner.next());
	} gd {
		return Double.parseDouble(scanner.next());
	} return Double.parseDouble(scanner.next()); Double.parseDouble(scanner.next()) Double.parseDouble Double scanner.next() scanner.next scanner public class Main {

	static Scanner scanner;

	public static void main(String[] args) {
	    scanner = new Scanner(System.in);

        int N=gi();
        long s=0;
        for (int i=1; i<=N;i++) {
        	if(i%3!=0 && i%5!=0) {
        		s+=i;
        	}
        }

        System.out.println(s);
	}


	public static long d(long n) {
		String a=String.valueOf(n);
		return (long)a.length();
	}

	// 文字列として入力を取得
	public static String gs() {
		return scanner.next();
	}

	// intとして入力を取得
	public static int gi() {
		return Integer.parseInt(scanner.next());
	}

	// longとして入力を取得
	public static long gl() {
		return Long.parseLong(scanner.next());
	}

	// doubleとして入力を取得
	public static double gd() {
		return Double.parseDouble(scanner.next());
	}
} public class Main {

	static Scanner scanner;

	public static void main(String[] args) {
	    scanner = new Scanner(System.in);

        int N=gi();
        long s=0;
        for (int i=1; i<=N;i++) {
        	if(i%3!=0 && i%5!=0) {
        		s+=i;
        	}
        }

        System.out.println(s);
	}


	public static long d(long n) {
		String a=String.valueOf(n);
		return (long)a.length();
	}

	// 文字列として入力を取得
	public static String gs() {
		return scanner.next();
	}

	// intとして入力を取得
	public static int gi() {
		return Integer.parseInt(scanner.next());
	}

	// longとして入力を取得
	public static long gl() {
		return Long.parseLong(scanner.next());
	}

	// doubleとして入力を取得
	public static double gd() {
		return Double.parseDouble(scanner.next());
	}
} Main

import java.util.Scanner;

public class Main {

	static Scanner scanner;

	public static void main(String[] args) {
	    scanner = new Scanner(System.in);

        int N=gi();
        long s=0;
        for (int i=1; i<=N;i++) {
        	if(i%3!=0 && i%5!=0) {
        		s+=i;
        	}
        }

        System.out.println(s);
	}


	public static long d(long n) {
		String a=String.valueOf(n);
		return (long)a.length();
	}

	// 文字列として入力を取得
	public static String gs() {
		return scanner.next();
	}

	// intとして入力を取得
	public static int gi() {
		return Integer.parseInt(scanner.next());
	}

	// longとして入力を取得
	public static long gl() {
		return Long.parseLong(scanner.next());
	}

	// doubleとして入力を取得
	public static double gd() {
		return Double.parseDouble(scanner.next());
	}
}