using System;

class Program
{
    static void Main(string[] args)
    {
        var value = ((double)2 / (double)7).ToString().Split('.');
        string d = value[1];

        int idx = int.Parse(Console.ReadLine());
        if (idx <= 7) Console.WriteLine(d[idx - 1]);
        else
        {
            idx = idx % 6;
            Console.WriteLine(d[idx-1]);
        }
    }
}