import java.util.Scanner;
public class Main {
	public static void main(String[] args) {
		Scanner scn = new Scanner(System.in);
		long N = scn.nextInt();
		scn.close();
		long sum = 0;
		for(long i = N;i>0;i--) {
			if(i%3 == 0) {
			}else if(i%5 == 0){
			}else {
			sum =sum+i;
			}
		}
		System.out.println(sum);
	}

} import java.util.Scanner; Scanner java.util public class Main {
	public static void main(String[] args) {
		Scanner scn = new Scanner(System.in);
		long N = scn.nextInt();
		scn.close();
		long sum = 0;
		for(long i = N;i>0;i--) {
			if(i%3 == 0) {
			}else if(i%5 == 0){
			}else {
			sum =sum+i;
			}
		}
		System.out.println(sum);
	}

} Main public static void main(String[] args) {
		Scanner scn = new Scanner(System.in);
		long N = scn.nextInt();
		scn.close();
		long sum = 0;
		for(long i = N;i>0;i--) {
			if(i%3 == 0) {
			}else if(i%5 == 0){
			}else {
			sum =sum+i;
			}
		}
		System.out.println(sum);
	} main {
		Scanner scn = new Scanner(System.in);
		long N = scn.nextInt();
		scn.close();
		long sum = 0;
		for(long i = N;i>0;i--) {
			if(i%3 == 0) {
			}else if(i%5 == 0){
			}else {
			sum =sum+i;
			}
		}
		System.out.println(sum);
	} Scanner scn = new Scanner(System.in); scn new Scanner(System.in) long N = scn.nextInt(); N scn.nextInt() scn.nextInt scn scn.close() scn.close scn long sum = 0; sum 0 for(long i = N;i>0;i--) {
			if(i%3 == 0) {
			}else if(i%5 == 0){
			}else {
			sum =sum+i;
			}
		} long i = N; long i = N; i N i>0 i 0 i-- i-- i {
			if(i%3 == 0) {
			}else if(i%5 == 0){
			}else {
			sum =sum+i;
			}
		} {
			if(i%3 == 0) {
			}else if(i%5 == 0){
			}else {
			sum =sum+i;
			}
		} if(i%3 == 0) {
			}else if(i%5 == 0){
			}else {
			sum =sum+i;
			} i%3 == 0 i%3 i 3 0 {
			} if(i%5 == 0){
			}else {
			sum =sum+i;
			} i%5 == 0 i%5 i 5 0 {
			} {
			sum =sum+i;
			} sum =sum+i sum 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) {
		Scanner scn = new Scanner(System.in);
		long N = scn.nextInt();
		scn.close();
		long sum = 0;
		for(long i = N;i>0;i--) {
			if(i%3 == 0) {
			}else if(i%5 == 0){
			}else {
			sum =sum+i;
			}
		}
		System.out.println(sum);
	}

} public class Main {
	public static void main(String[] args) {
		Scanner scn = new Scanner(System.in);
		long N = scn.nextInt();
		scn.close();
		long sum = 0;
		for(long i = N;i>0;i--) {
			if(i%3 == 0) {
			}else if(i%5 == 0){
			}else {
			sum =sum+i;
			}
		}
		System.out.println(sum);
	}

} Main
import java.util.Scanner;
public class Main {
	public static void main(String[] args) {
		Scanner scn = new Scanner(System.in);
		long N = scn.nextInt();
		scn.close();
		long sum = 0;
		for(long i = N;i>0;i--) {
			if(i%3 == 0) {
			}else if(i%5 == 0){
			}else {
			sum =sum+i;
			}
		}
		System.out.println(sum);
	}

}
