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