import java.util.Scanner;

public class Main {
	public static void main(String[] args) {
		Scanner sc=new Scanner(System.in);
		int n=sc.nextInt();
		long sum=0;
		sc.close();
		for(int i=1;i<=n;i++) {
			if(!(i%3==0 || i%5==0)) sum+=(long)i;
		}
		System.out.println(sum);
	}
} import java.util.Scanner; Scanner java.util public class Main {
	public static void main(String[] args) {
		Scanner sc=new Scanner(System.in);
		int n=sc.nextInt();
		long sum=0;
		sc.close();
		for(int i=1;i<=n;i++) {
			if(!(i%3==0 || i%5==0)) sum+=(long)i;
		}
		System.out.println(sum);
	}
} Main public static void main(String[] args) {
		Scanner sc=new Scanner(System.in);
		int n=sc.nextInt();
		long sum=0;
		sc.close();
		for(int i=1;i<=n;i++) {
			if(!(i%3==0 || i%5==0)) sum+=(long)i;
		}
		System.out.println(sum);
	} main {
		Scanner sc=new Scanner(System.in);
		int n=sc.nextInt();
		long sum=0;
		sc.close();
		for(int i=1;i<=n;i++) {
			if(!(i%3==0 || i%5==0)) sum+=(long)i;
		}
		System.out.println(sum);
	} Scanner sc=new Scanner(System.in); sc new Scanner(System.in) int n=sc.nextInt(); n sc.nextInt() sc.nextInt sc long sum=0; sum 0 sc.close() sc.close sc for(int i=1;i<=n;i++) {
			if(!(i%3==0 || i%5==0)) sum+=(long)i;
		} int i=1; int i=1; i 1 i<=n i n i++ i++ i {
			if(!(i%3==0 || i%5==0)) sum+=(long)i;
		} {
			if(!(i%3==0 || i%5==0)) sum+=(long)i;
		} if(!(i%3==0 || i%5==0)) sum+=(long)i; !(i%3==0 || i%5==0) (i%3==0 || i%5==0) i%3==0 i%3 i 3 0 i%5==0 i%5 i 5 0 sum+=(long)i sum (long)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 sc=new Scanner(System.in);
		int n=sc.nextInt();
		long sum=0;
		sc.close();
		for(int i=1;i<=n;i++) {
			if(!(i%3==0 || i%5==0)) sum+=(long)i;
		}
		System.out.println(sum);
	}
} public class Main {
	public static void main(String[] args) {
		Scanner sc=new Scanner(System.in);
		int n=sc.nextInt();
		long sum=0;
		sc.close();
		for(int i=1;i<=n;i++) {
			if(!(i%3==0 || i%5==0)) sum+=(long)i;
		}
		System.out.println(sum);
	}
} Main
import java.util.Scanner;

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