import java.util.*;

public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        long N = sc.nextLong();
        long FizzBuzz = -1;
        long Buzz = -2;
        long Fizz = -3;
        long sum = 0;
        for(long i = 1; i <= N; i++){
            if(i%3 != 0 && i%5 != 0){
                sum = sum + i;
            }else{

            }
        }
        System.out.println(sum);
    }
}  import java.util.*; util.* java public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        long N = sc.nextLong();
        long FizzBuzz = -1;
        long Buzz = -2;
        long Fizz = -3;
        long sum = 0;
        for(long i = 1; i <= N; i++){
            if(i%3 != 0 && i%5 != 0){
                sum = sum + i;
            }else{

            }
        }
        System.out.println(sum);
    }
} Main public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        long N = sc.nextLong();
        long FizzBuzz = -1;
        long Buzz = -2;
        long Fizz = -3;
        long sum = 0;
        for(long i = 1; i <= N; i++){
            if(i%3 != 0 && i%5 != 0){
                sum = sum + i;
            }else{

            }
        }
        System.out.println(sum);
    } main {
        Scanner sc = new Scanner(System.in);
        long N = sc.nextLong();
        long FizzBuzz = -1;
        long Buzz = -2;
        long Fizz = -3;
        long sum = 0;
        for(long i = 1; i <= N; i++){
            if(i%3 != 0 && i%5 != 0){
                sum = sum + i;
            }else{

            }
        }
        System.out.println(sum);
    } Scanner sc = new Scanner(System.in); sc new Scanner(System.in) long N = sc.nextLong(); N sc.nextLong() sc.nextLong sc long FizzBuzz = -1; FizzBuzz -1 1 long Buzz = -2; Buzz -2 2 long Fizz = -3; Fizz -3 3 long sum = 0; sum 0 for(long i = 1; i <= N; i++){
            if(i%3 != 0 && i%5 != 0){
                sum = sum + i;
            }else{

            }
        } long i = 1; long i = 1; i 1 i <= N i N i++ i++ i {
            if(i%3 != 0 && i%5 != 0){
                sum = sum + i;
            }else{

            }
        } {
            if(i%3 != 0 && i%5 != 0){
                sum = sum + i;
            }else{

            }
        } if(i%3 != 0 && i%5 != 0){
                sum = sum + i;
            }else{

            } i%3 != 0 && i%5 != 0 i%3 != 0 i%3 i 3 0 i%5 != 0 i%5 i 5 0 {
                sum = sum + i;
            } sum = sum + i sum sum + i sum i {

            } 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 sc = new Scanner(System.in);
        long N = sc.nextLong();
        long FizzBuzz = -1;
        long Buzz = -2;
        long Fizz = -3;
        long sum = 0;
        for(long i = 1; i <= N; i++){
            if(i%3 != 0 && i%5 != 0){
                sum = sum + i;
            }else{

            }
        }
        System.out.println(sum);
    }
} public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        long N = sc.nextLong();
        long FizzBuzz = -1;
        long Buzz = -2;
        long Fizz = -3;
        long sum = 0;
        for(long i = 1; i <= N; i++){
            if(i%3 != 0 && i%5 != 0){
                sum = sum + i;
            }else{

            }
        }
        System.out.println(sum);
    }
} Main
import java.util.*;

public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        long N = sc.nextLong();
        long FizzBuzz = -1;
        long Buzz = -2;
        long Fizz = -3;
        long sum = 0;
        for(long i = 1; i <= N; i++){
            if(i%3 != 0 && i%5 != 0){
                sum = sum + i;
            }else{

            }
        }
        System.out.println(sum);
    }
} 