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

namespace YukiCoder
{
    class Program
    {
        static void Main(string[] args)
        {
            int nn = int.Parse(Console.ReadLine());
            int mm = nn - 7;
            int i;

            for (i = mm / 7; i > 0; i--)
            {
                if (mm % i == 0) break;
            }
            Console.WriteLine(mm/i);
            Console.ReadLine();
        }
    }
}