import java.util.Scanner;

public class Main {

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

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

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

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

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

} public class Main {

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

} Main
import java.util.Scanner;

public class Main {

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

}
