TransportPrice

using System;

namespace TransportPrice

{
    class TransportPrice

    {
        static void Main()
        {
            int n = int.Parse(Console.ReadLine());
            string Time = Console.ReadLine();
            double Bus = n * .09;
            double Train = n * .06;
            bool a = ((n >= 1) && (n <= 5000) && !(n > 5000));
            if ((n < 20) && a)
            {
                if (Time == "day")
                {
                Console.WriteLine(n * .79 + .7);
                }
                else
                if (Time == "night")
                {
                Console.WriteLine(n * .9 + .7);
                }
            }
            else
            {
                if ((n >= 20) && (n < 100) && a)
                {
                Console.WriteLine(Bus);
                }
                else
                if ((n >= 100) && a)
                {
                double Min = Math.Min(Bus, Train);
                Console.WriteLine(Min);
                }
            }
        }
    }
}