using System;
using static System.Console;
using System.Linq;
using System.Collections.Generic;

class Program
{
    static int NN => int.Parse(ReadLine());
    static long[] NList => ReadLine().Split().Select(long.Parse).ToArray();
    public static void Main()
    {
        Solve();
    }
    static void Solve()
    {
        var n = NN;
        var day = 1;
        while (true)
        {
            if (day % 7 == 0) n += 6;
            --n;
            if (n == 0)
            {
                WriteLine(day);
                return;
            }
            ++day;
        }
    }
}