using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace ConsoleApp1
{
    class Program
    {
        static void Main(string[] args)
        {
            int N = int.Parse(Console.ReadLine());
            int n = N;
            int answer = 0;
            int count = 0;
            int a = 1;
            while (true)
            {
                if(n < 1)
                {
                    break;
                }
                n = n / 10;
                count++;
            }
            for (int i = 1; i <= count; i++)  
            {
                answer += (N % 7) * a;
                N = N / 7;
                a *= 10;
            }
            Console.WriteLine(answer);
        }
    }
}