using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

using System.Threading.Tasks;

​

namespace TransportPrice

{

    class TransportPrice

    {

        static void Main(string[] args)

        {

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

            string time = Console.ReadLine();

​

            double taxi = 0.70;

            double autobus = 0.09;

            double train = 0.06;

            double sum = 0;

​

            if (distanceKm <= 19 && time == "day")

            {

                sum = taxi + distanceKm * 0.79;

            }

            else if (distanceKm <= 19 && time == "night")

            {

                sum = taxi + distanceKm * 0.90;

            }

            // else if (distanceKm >= 20 && distanceKm <= 99)

            else if (distanceKm >= 20 && distanceKm <= 99 && (time == "day" || time == "night"))

            {

                sum = autobus * distanceKm;

            }

            // else if (distanceKm >= 100)

            else if (distanceKm >= 100 && (time == "day" || time == "night"))

            {

                sum = train * distanceKm;

            }

            Console.WriteLine("{0}", sum);

        }

    }

}