import java.util.Scanner;

public class Main {

	public static void main(String[] args) {
		Scanner in = new Scanner(System.in);
		long n=in.nextInt();
		long sum=0;
		for(long i=0;i<=n;i++) {
			if(i%3!=0 && i%5!=0)sum+=i;
		}
		System.out.println(sum);
	}

} import java.util.Scanner; Scanner java.util public class Main {

	public static void main(String[] args) {
		Scanner in = new Scanner(System.in);
		long n=in.nextInt();
		long sum=0;
		for(long i=0;i<=n;i++) {
			if(i%3!=0 && i%5!=0)sum+=i;
		}
		System.out.println(sum);
	}

} Main public static void main(String[] args) {
		Scanner in = new Scanner(System.in);
		long n=in.nextInt();
		long sum=0;
		for(long i=0;i<=n;i++) {
			if(i%3!=0 && i%5!=0)sum+=i;
		}
		System.out.println(sum);
	} main {
		Scanner in = new Scanner(System.in);
		long n=in.nextInt();
		long sum=0;
		for(long i=0;i<=n;i++) {
			if(i%3!=0 && i%5!=0)sum+=i;
		}
		System.out.println(sum);
	} Scanner in = new Scanner(System.in); in new Scanner(System.in) long n=in.nextInt(); n in.nextInt() in.nextInt in long sum=0; sum 0 for(long i=0;i<=n;i++) {
			if(i%3!=0 && i%5!=0)sum+=i;
		} long i=0; long i=0; i 0 i<=n i n i++ i++ i {
			if(i%3!=0 && i%5!=0)sum+=i;
		} {
			if(i%3!=0 && i%5!=0)sum+=i;
		} if(i%3!=0 && i%5!=0)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 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 in = new Scanner(System.in);
		long n=in.nextInt();
		long sum=0;
		for(long i=0;i<=n;i++) {
			if(i%3!=0 && i%5!=0)sum+=i;
		}
		System.out.println(sum);
	}

} public class Main {

	public static void main(String[] args) {
		Scanner in = new Scanner(System.in);
		long n=in.nextInt();
		long sum=0;
		for(long i=0;i<=n;i++) {
			if(i%3!=0 && i%5!=0)sum+=i;
		}
		System.out.println(sum);
	}

} Main
import java.util.Scanner;

public class Main {

	public static void main(String[] args) {
		Scanner in = new Scanner(System.in);
		long n=in.nextInt();
		long sum=0;
		for(long i=0;i<=n;i++) {
			if(i%3!=0 && i%5!=0)sum+=i;
		}
		System.out.println(sum);
	}

}
