using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace Cena_na_transport
{
    class Program
    {
        static void Main(string[] args)
        {
            var km = int.Parse(Console.ReadLine());
            string time = Console.ReadLine();
            var dkmTaxi =  0.79;
            var nkmTaxi = 0.90;
            var tarifTaxi = 0.70;


            var price = 0.0;
            if (km <20)
            {
                if(time=="day")
                {
                    price = (km * dkmTaxi) + tarifTaxi;
                }
                else if (time=="night")
                {
                     price = (km * nkmTaxi) + tarifTaxi;
                }
            }

            if (km >20 && km<100)
            {
                price = km * 0.09;
            }
            else if(km>100)
            {
                price = km * 0.06;
            }
            {
                Console.WriteLine(price);
            }

        }
    }
}