using System;

namespace _499
{
    class Program
    {
        static void Main(string[] args)
        {
            int n = int.Parse(Console.ReadLine());
            string ret = "";
            for (; n >= 7; n++)
            {
                ret = n % 7 + ret;
                n /= 7;
                n--;
            }
            Console.WriteLine(n + ret);
        }
    }
}