using System.Numerics;

public class Program
{
    public static void Main()
    {

        BigInteger num = BigInteger.Parse(Console.ReadLine() ?? string.Empty);
        //int num = int.Parse(Console.ReadLine() ?? string.Empty);
        //string[] moji = (Console.ReadLine() ?? string.Empty).Trim().Split(' ');
        //string str = Console.ReadLine() ?? string.Empty;

        if(num % 15  == 0)
        {
            BigInteger a = num/ 15;
            Console.WriteLine(a * 16);
            return;
        }

        BigInteger d = 0;
        //string fizzbuzz = "";
        for(int i = 1;i <= num;i++)
        {
            if(i% 3==0)
            {
                d++;
                //fizzbuzz += "zz";
            }
            if(i % 5==0)
            {
                d++;
                //fizzbuzz += "zz";
            }            
        }
        //fizzbuzz = fizzbuzz.Replace("Fi", "").Replace("Bu", "");
        Console.WriteLine(d*2);
    }
}