TransportPrice

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

namespace TransportPrice
{
    class Program
    {
        static void Main(string[] args)
        {
            int distance = int.Parse(Console.ReadLine());
            String timeOfDay = Console.ReadLine();
            if (distance >= 100)
            {
                double price = distance * 0.06;
                Console.WriteLine("{0:F2}", price);
            }
            else if (distance >= 20)
            {
                double price = distance * 0.09;
                Console.WriteLine("{0:F2}", price);
            }
            else
            {
                double price = 0.70;
                if (timeOfDay == "day")
                {
                    price += distance * 0.79;
                }
                else if (timeOfDay == "night")
                {
                    price += distance * 0.90;
                }
                Console.WriteLine("{0:F2}", price);
            }
        }
    }
}