Аквапарк; Aquapark

using System;

namespace tESt
{
    class Program
    {
        static void Main(string[] args)
        {
            var month = Console.ReadLine().ToLower();

            var hours = int.Parse(Console.ReadLine());
            var groupNumber = int.Parse(Console.ReadLine());
            var timeDay = Console.ReadLine().ToLower(); //"day" , "night

            double price = 0;


            if (timeDay == "day")
            {
                if (month == "march" || month == "april" || month == "may")
                {
                    price =  10.50;  // day March - May
                }
                else if (month == "june" || month == "july"  || month == "august")
                {
                    price =  12.60;  // day June - August
                }
                else
                {
                    Console.WriteLine("ERROR");
                }
            }
            else
            {
                if (month == "march" || month == "april" || month == "may")
                {
                    price =  8.40;  // night March - May
                }
                else if (month == "june" || month == "july" || month == "august")
                {
                    price =  10.20;  // night June - August
                }
                else
                {
                    Console.WriteLine("ERROR");
                }
            }

            var totalPrice = price * hours * groupNumber;

            if (groupNumber >= 4)
            {
                totalPrice = totalPrice - (totalPrice * 0.10); // -10%
                price = price - (price * 0.10); // -10%

            }
            if (hours >= 5)
            {
                totalPrice = totalPrice - (totalPrice * 0.50); // -50%
                price = price - (price * 0.50); // -50%
            }
            Console.WriteLine($"Price per person for one hour: {price:f2}");  // per person
            Console.WriteLine($"Total cost of the visit: {totalPrice:f2}");
        }
    }
}