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;i++){
           if(i%3!=0&&i%5!=0){
             a=a+i;   
           } 
          }
           System.out.print(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;i++){
           if(i%3!=0&&i%5!=0){
             a=a+i;   
           } 
          }
           System.out.print(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;i++){
           if(i%3!=0&&i%5!=0){
             a=a+i;   
           } 
          }
           System.out.print(a);
        } main {
        Scanner sc = new Scanner(System.in);
          
          int N =sc.nextInt();
          long a =0;
          for(int i=1;i<=N;i++){
           if(i%3!=0&&i%5!=0){
             a=a+i;   
           } 
          }
           System.out.print(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;i++){
           if(i%3!=0&&i%5!=0){
             a=a+i;   
           } 
          } int i=1; int i=1; i 1 i<=N i N i++ i++ i {
           if(i%3!=0&&i%5!=0){
             a=a+i;   
           } 
          } {
           if(i%3!=0&&i%5!=0){
             a=a+i;   
           } 
          } if(i%3!=0&&i%5!=0){
             a=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=a+i;   
           } a=a+i a a+i a i System.out.print(a) System.out.print 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;i++){
           if(i%3!=0&&i%5!=0){
             a=a+i;   
           } 
          }
           System.out.print(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;i++){
           if(i%3!=0&&i%5!=0){
             a=a+i;   
           } 
          }
           System.out.print(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;i++){
           if(i%3!=0&&i%5!=0){
             a=a+i;   
           } 
          }
           System.out.print(a);
        }
}