import java.util.Scanner;

public class Main {

	public static void main(String[] args) {

		Scanner scan = new Scanner(System.in);

		long n = scan.nextLong();

		long total = 0;

		for(int i = 1; i <= n; i++) {

			if(i % 3 != 0 && i % 5 != 0 ) {
				total += i;
			}
			
		}

		System.out.println(total);
	}
} import java.util.Scanner; Scanner java.util public class Main {

	public static void main(String[] args) {

		Scanner scan = new Scanner(System.in);

		long n = scan.nextLong();

		long total = 0;

		for(int i = 1; i <= n; i++) {

			if(i % 3 != 0 && i % 5 != 0 ) {
				total += i;
			}
			
		}

		System.out.println(total);
	}
} Main public static void main(String[] args) {

		Scanner scan = new Scanner(System.in);

		long n = scan.nextLong();

		long total = 0;

		for(int i = 1; i <= n; i++) {

			if(i % 3 != 0 && i % 5 != 0 ) {
				total += i;
			}
			
		}

		System.out.println(total);
	} main {

		Scanner scan = new Scanner(System.in);

		long n = scan.nextLong();

		long total = 0;

		for(int i = 1; i <= n; i++) {

			if(i % 3 != 0 && i % 5 != 0 ) {
				total += i;
			}
			
		}

		System.out.println(total);
	} Scanner scan = new Scanner(System.in); scan new Scanner(System.in) long n = scan.nextLong(); n scan.nextLong() scan.nextLong scan long total = 0; total 0 for(int i = 1; i <= n; i++) {

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

			if(i % 3 != 0 && i % 5 != 0 ) {
				total += i;
			}
			
		} {

			if(i % 3 != 0 && i % 5 != 0 ) {
				total += i;
			}
			
		} if(i % 3 != 0 && i % 5 != 0 ) {
				total += i;
			} i % 3 != 0 && i % 5 != 0 i % 3 != 0 i % 3 i 3 0 i % 5 != 0 i % 5 i 5 0 {
				total += i;
			} total += i total i System.out.println(total) System.out.println System.out System System.out total String[] args args public class Main {

	public static void main(String[] args) {

		Scanner scan = new Scanner(System.in);

		long n = scan.nextLong();

		long total = 0;

		for(int i = 1; i <= n; i++) {

			if(i % 3 != 0 && i % 5 != 0 ) {
				total += i;
			}
			
		}

		System.out.println(total);
	}
} public class Main {

	public static void main(String[] args) {

		Scanner scan = new Scanner(System.in);

		long n = scan.nextLong();

		long total = 0;

		for(int i = 1; i <= n; i++) {

			if(i % 3 != 0 && i % 5 != 0 ) {
				total += i;
			}
			
		}

		System.out.println(total);
	}
} Main
import java.util.Scanner;

public class Main {

	public static void main(String[] args) {

		Scanner scan = new Scanner(System.in);

		long n = scan.nextLong();

		long total = 0;

		for(int i = 1; i <= n; i++) {

			if(i % 3 != 0 && i % 5 != 0 ) {
				total += i;
			}
			
		}

		System.out.println(total);
	}
}