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)
        {
            //Input
            double decorationPrice = double.Parse(Console.ReadLine());

            //Calculations
            double pizza = decorationPrice * 2;
            double Drinks = pizza * 0.85;

            double pizzaanddrinks = pizza + Drinks;

            double bordGames = pizzaanddrinks * (0.1428571428571429);

            Console.WriteLine($"{bordGames + pizza + Drinks + decorationPrice:f2}");


        }
    }
}