import java.util.Scanner;

public class No637_FizzBizz {
    public static void main(String[] args) {

        Scanner scan = new Scanner(System.in);
        int number = scan.nextInt();
        int[] list = new int[number];

        int count = 0;

        for (int i = 0; i < list.length; i++) {

            int value = list[i];

            if (value % 3 == 0 && value % 5 == 0) {
                count = count + 8;
            } else if (value % 3 == 0 && value % 5 != 0) {
                count = count + 4;
            } else if (value % 3 != 0 && value % 5 == 0) {
                count = count + 4;
            } else {
                count = count + String.valueOf(value).length();
            }
        }

        System.out.println(count);

    }
}