import java.util.*;
import java.math.*;
     
class Main{
    public static void main(String[] args) {
        
        try(Scanner sc = new Scanner(System.in)){
 
            int n = Integer.parseInt(sc.next());
            long ans = 0;

            for(int i = 1; i <= n; i++){
                if(i % 3 != 0 && i % 5 != 0){
                    ans += i;
                }
            }

            System.out.println(ans);
            

        }catch(Exception e){
            e.printStackTrace();
        }        
    }
} import java.util.*; util.* java import java.math.*; math.* java class Main{
    public static void main(String[] args) {
        
        try(Scanner sc = new Scanner(System.in)){
 
            int n = Integer.parseInt(sc.next());
            long ans = 0;

            for(int i = 1; i <= n; i++){
                if(i % 3 != 0 && i % 5 != 0){
                    ans += i;
                }
            }

            System.out.println(ans);
            

        }catch(Exception e){
            e.printStackTrace();
        }        
    }
} Main public static void main(String[] args) {
        
        try(Scanner sc = new Scanner(System.in)){
 
            int n = Integer.parseInt(sc.next());
            long ans = 0;

            for(int i = 1; i <= n; i++){
                if(i % 3 != 0 && i % 5 != 0){
                    ans += i;
                }
            }

            System.out.println(ans);
            

        }catch(Exception e){
            e.printStackTrace();
        }        
    } main {
        
        try(Scanner sc = new Scanner(System.in)){
 
            int n = Integer.parseInt(sc.next());
            long ans = 0;

            for(int i = 1; i <= n; i++){
                if(i % 3 != 0 && i % 5 != 0){
                    ans += i;
                }
            }

            System.out.println(ans);
            

        }catch(Exception e){
            e.printStackTrace();
        }        
    } try(Scanner sc = new Scanner(System.in)){
 
            int n = Integer.parseInt(sc.next());
            long ans = 0;

            for(int i = 1; i <= n; i++){
                if(i % 3 != 0 && i % 5 != 0){
                    ans += i;
                }
            }

            System.out.println(ans);
            

        }catch(Exception e){
            e.printStackTrace();
        } catch(Exception e){
            e.printStackTrace();
        } Exception e {
            e.printStackTrace();
        } e.printStackTrace() e.printStackTrace e {
 
            int n = Integer.parseInt(sc.next());
            long ans = 0;

            for(int i = 1; i <= n; i++){
                if(i % 3 != 0 && i % 5 != 0){
                    ans += i;
                }
            }

            System.out.println(ans);
            

        } Scanner sc = new Scanner(System.in) Scanner sc = new Scanner(System.in) new Scanner(System.in) int n = Integer.parseInt(sc.next()); n Integer.parseInt(sc.next()) Integer.parseInt Integer sc.next() sc.next sc long ans = 0; ans 0 for(int i = 1; i <= n; i++){
                if(i % 3 != 0 && i % 5 != 0){
                    ans += i;
                }
            } int i = 1; int i = 1; i 1 i <= n i n 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 % 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
import java.util.*;
import java.math.*;
     
class Main{
    public static void main(String[] args) {
        
        try(Scanner sc = new Scanner(System.in)){
 
            int n = Integer.parseInt(sc.next());
            long ans = 0;

            for(int i = 1; i <= n; i++){
                if(i % 3 != 0 && i % 5 != 0){
                    ans += i;
                }
            }

            System.out.println(ans);
            

        }catch(Exception e){
            e.printStackTrace();
        }        
    }
}