import java.util.Scanner;

public class Main {
	public static void main(String[] args){
		Scanner sc = new Scanner(System.in);
		int n = 0;

		n = sc.nextInt();
		long ans = 0;
        for (int i = 0; i < n+1; i++) {
            if(!(i % 3 == 0 || i % 5 == 0)){
            	ans += i;
            }
        }



			System.out.println(ans);

	}
} import java.util.Scanner; Scanner java.util public class Main {
	public static void main(String[] args){
		Scanner sc = new Scanner(System.in);
		int n = 0;

		n = sc.nextInt();
		long ans = 0;
        for (int i = 0; i < n+1; i++) {
            if(!(i % 3 == 0 || i % 5 == 0)){
            	ans += i;
            }
        }



			System.out.println(ans);

	}
} Main public static void main(String[] args){
		Scanner sc = new Scanner(System.in);
		int n = 0;

		n = sc.nextInt();
		long ans = 0;
        for (int i = 0; i < n+1; i++) {
            if(!(i % 3 == 0 || i % 5 == 0)){
            	ans += i;
            }
        }



			System.out.println(ans);

	} main {
		Scanner sc = new Scanner(System.in);
		int n = 0;

		n = sc.nextInt();
		long ans = 0;
        for (int i = 0; i < n+1; i++) {
            if(!(i % 3 == 0 || i % 5 == 0)){
            	ans += i;
            }
        }



			System.out.println(ans);

	} Scanner sc = new Scanner(System.in); sc new Scanner(System.in) int n = 0; n 0 n = sc.nextInt() n sc.nextInt() sc.nextInt sc long ans = 0; ans 0 for (int i = 0; i < n+1; i++) {
            if(!(i % 3 == 0 || i % 5 == 0)){
            	ans += i;
            }
        } int i = 0; int i = 0; i 0 i < n+1 i n+1 n 1 i++ i++ i {
            if(!(i % 3 == 0 || i % 5 == 0)){
            	ans += i;
            }
        } {
            if(!(i % 3 == 0 || i % 5 == 0)){
            	ans += i;
            }
        } if(!(i % 3 == 0 || i % 5 == 0)){
            	ans += 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 {
            	ans += i;
            } 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 sc = new Scanner(System.in);
		int n = 0;

		n = sc.nextInt();
		long ans = 0;
        for (int i = 0; i < n+1; i++) {
            if(!(i % 3 == 0 || i % 5 == 0)){
            	ans += i;
            }
        }



			System.out.println(ans);

	}
} public class Main {
	public static void main(String[] args){
		Scanner sc = new Scanner(System.in);
		int n = 0;

		n = sc.nextInt();
		long ans = 0;
        for (int i = 0; i < n+1; i++) {
            if(!(i % 3 == 0 || i % 5 == 0)){
            	ans += i;
            }
        }



			System.out.println(ans);

	}
} Main
import java.util.Scanner;

public class Main {
	public static void main(String[] args){
		Scanner sc = new Scanner(System.in);
		int n = 0;

		n = sc.nextInt();
		long ans = 0;
        for (int i = 0; i < n+1; i++) {
            if(!(i % 3 == 0 || i % 5 == 0)){
            	ans += i;
            }
        }



			System.out.println(ans);

	}
}