using System;

namespace Birthday_party
{
    class Program
    {
        static void Main(string[] args)
        {

            int roomRent = int.Parse(Console.ReadLine());

            double cakePrice = roomRent * 0.20;
            double refreshmentsPrice = cakePrice - 0.45;
            double AnimatorPrice = 1 / 3 * roomRent;

            double neededMoney = roomRent + cakePrice + refreshmentsPrice + AnimatorPrice;

            Console.WriteLine(neededMoney);






        }
    }
}