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