import java.util.*;

public class Main{
	public static void main(String[] args){
		Scanner scan = new Scanner(System.in);
		long n = scan.nextLong();
		long sum =0;

		for(long i=1; i<=n; i++){
			if(i % 3 == 0  || i %5 ==0 ){

			}else{
				sum += i;
			}
		}

		System.out.println(sum);
	}
} import java.util.*; util.* java public class Main{
	public static void main(String[] args){
		Scanner scan = new Scanner(System.in);
		long n = scan.nextLong();
		long sum =0;

		for(long i=1; i<=n; i++){
			if(i % 3 == 0  || i %5 ==0 ){

			}else{
				sum += i;
			}
		}

		System.out.println(sum);
	}
} Main public static void main(String[] args){
		Scanner scan = new Scanner(System.in);
		long n = scan.nextLong();
		long sum =0;

		for(long i=1; i<=n; i++){
			if(i % 3 == 0  || i %5 ==0 ){

			}else{
				sum += i;
			}
		}

		System.out.println(sum);
	} main {
		Scanner scan = new Scanner(System.in);
		long n = scan.nextLong();
		long sum =0;

		for(long i=1; i<=n; i++){
			if(i % 3 == 0  || i %5 ==0 ){

			}else{
				sum += i;
			}
		}

		System.out.println(sum);
	} Scanner scan = new Scanner(System.in); scan new Scanner(System.in) long n = scan.nextLong(); n scan.nextLong() scan.nextLong scan long sum =0; sum 0 for(long i=1; i<=n; i++){
			if(i % 3 == 0  || i %5 ==0 ){

			}else{
				sum += i;
			}
		} long i=1; long i=1; i 1 i<=n i n 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.println(sum) System.out.println System.out System System.out sum String[] args args public class Main{
	public static void main(String[] args){
		Scanner scan = new Scanner(System.in);
		long n = scan.nextLong();
		long sum =0;

		for(long i=1; i<=n; i++){
			if(i % 3 == 0  || i %5 ==0 ){

			}else{
				sum += i;
			}
		}

		System.out.println(sum);
	}
} public class Main{
	public static void main(String[] args){
		Scanner scan = new Scanner(System.in);
		long n = scan.nextLong();
		long sum =0;

		for(long i=1; i<=n; i++){
			if(i % 3 == 0  || i %5 ==0 ){

			}else{
				sum += i;
			}
		}

		System.out.println(sum);
	}
} Main
import java.util.*;

public class Main{
	public static void main(String[] args){
		Scanner scan = new Scanner(System.in);
		long n = scan.nextLong();
		long sum =0;

		for(long i=1; i<=n; i++){
			if(i % 3 == 0  || i %5 ==0 ){

			}else{
				sum += i;
			}
		}

		System.out.println(sum);
	}
}