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