family trip

using System;

namespace exampreparation

{
    class Program
    {
        static void Main(string[] args)
        {
            double budget = double.Parse(Console.ReadLine());
            int nightStays = int.Parse(Console.ReadLine());
            double pricePerNight = double.Parse(Console.ReadLine());
            int percenteExp = int.Parse(Console.ReadLine());

            if (nightStays > 7)
            {
                pricePerNight *= 0.95;
            }

            double stayPrice = (nightStays * pricePerNight) + budget * (percenteExp / 100.0);

            if (stayPrice <= budget)
            {
                Console.WriteLine($"Ivanovi will be left with {budget - stayPrice:f2} leva after vacation.");
            }
            else
            {
                Console.WriteLine($"{stayPrice - budget:f2} leva needed.");
            }
        }
    }
}