import java.util.*;

public class Main {

	public static void main(String[] args) {
		Main main = new Main();
		main.run();
	}

	public void run() {
		Scanner sc = new Scanner(System.in);
		long n = sc.nextLong();
		long ans = 0;
		for(long i=1; i<=n; i++) {
			if(i%3==0||i%5==0) continue;
			ans += i;
		}
		System.out.println(ans);
		sc.close();
	}


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

	public static void main(String[] args) {
		Main main = new Main();
		main.run();
	}

	public void run() {
		Scanner sc = new Scanner(System.in);
		long n = sc.nextLong();
		long ans = 0;
		for(long i=1; i<=n; i++) {
			if(i%3==0||i%5==0) continue;
			ans += i;
		}
		System.out.println(ans);
		sc.close();
	}


} Main public static void main(String[] args) {
		Main main = new Main();
		main.run();
	} main {
		Main main = new Main();
		main.run();
	} Main main = new Main(); main new Main() main.run() main.run main String[] args args public void run() {
		Scanner sc = new Scanner(System.in);
		long n = sc.nextLong();
		long ans = 0;
		for(long i=1; i<=n; i++) {
			if(i%3==0||i%5==0) continue;
			ans += i;
		}
		System.out.println(ans);
		sc.close();
	} run {
		Scanner sc = new Scanner(System.in);
		long n = sc.nextLong();
		long ans = 0;
		for(long i=1; i<=n; i++) {
			if(i%3==0||i%5==0) continue;
			ans += i;
		}
		System.out.println(ans);
		sc.close();
	} Scanner sc = new Scanner(System.in); sc new Scanner(System.in) long n = sc.nextLong(); n sc.nextLong() sc.nextLong sc long ans = 0; ans 0 for(long i=1; i<=n; i++) {
			if(i%3==0||i%5==0) continue;
			ans += i;
		} long i=1; long i=1; i 1 i<=n i n i++ i++ i {
			if(i%3==0||i%5==0) continue;
			ans += i;
		} {
			if(i%3==0||i%5==0) continue;
			ans += i;
		} if(i%3==0||i%5==0) continue; i%3==0||i%5==0 i%3==0 i%3 i 3 0 i%5==0 i%5 i 5 0 continue; ans += i ans i System.out.println(ans) System.out.println System.out System System.out ans sc.close() sc.close sc public class Main {

	public static void main(String[] args) {
		Main main = new Main();
		main.run();
	}

	public void run() {
		Scanner sc = new Scanner(System.in);
		long n = sc.nextLong();
		long ans = 0;
		for(long i=1; i<=n; i++) {
			if(i%3==0||i%5==0) continue;
			ans += i;
		}
		System.out.println(ans);
		sc.close();
	}


} public class Main {

	public static void main(String[] args) {
		Main main = new Main();
		main.run();
	}

	public void run() {
		Scanner sc = new Scanner(System.in);
		long n = sc.nextLong();
		long ans = 0;
		for(long i=1; i<=n; i++) {
			if(i%3==0||i%5==0) continue;
			ans += i;
		}
		System.out.println(ans);
		sc.close();
	}


} Main
import java.util.*;

public class Main {

	public static void main(String[] args) {
		Main main = new Main();
		main.run();
	}

	public void run() {
		Scanner sc = new Scanner(System.in);
		long n = sc.nextLong();
		long ans = 0;
		for(long i=1; i<=n; i++) {
			if(i%3==0||i%5==0) continue;
			ans += i;
		}
		System.out.println(ans);
		sc.close();
	}


}
