using System.Numerics;

public class Program
{
    public static void Main()
    {

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

        if(num <= 6)
        {
            Console.WriteLine(num);
        }
        else
        {
            int day = 0;
            while (num > 0)
            {
                day++;
                num--;
                if(day % 7 == 0)
                {
                    num += 6;
                }
            }
            Console.WriteLine(day);
        }
        



    }
}