using System;

namespace Fishland
{
    class Program
    {
        static void Main(string[] args)
        {
            string month = Console.ReadLine();
            int spendHours = int.Parse(Console.ReadLine());
            int people = int.Parse(Console.ReadLine());
            string timeOfDay = Console.ReadLine();

            double price = 0;

            if (month == "march" || month == "april" || month == "may")
            {
                if (timeOfDay == "day")
                {
                    price = spendHours * people * 10.50;

                }
                else if (timeOfDay == "night")
                {
                    price = spendHours * people * 8.40;
                }
            }

            else if (month == "jun" || month == "july" || month == "august")
            {
                if (timeOfDay == "day")
                {
                    price = spendHours * people * 12.60;

                }
                else if (timeOfDay == "night")
                {
                    price = spendHours * people * 10.20;
                }


            }
            if (people <= 5)
            {
                price = price * 0.1;
            }

                Console.WriteLine($"Price per person for one hour: {price}");
        }
    }
}
//march
//3
//3
//day