import java.util.*;
import java.io.*;
import java.lang.*;

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

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

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

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

        int n = sc.nextInt();
        long ans = 0;
        for (int i = 1; i<=n; 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 = sc.nextInt();
        long ans = 0;
        for (int i = 1; i<=n; i++){
            if ((i%3) != 0 && (i%5) != 0){
                ans += i;
            }
        }
        System.out.println(ans);
    }
} Main
import java.util.*;
import java.io.*;
import java.lang.*;

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

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