transport price

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
namespace silvanadoc
{
    class silvanadoc
    {
        static void Main(string[] args)
        {
            int kilometres = int.Parse(Console.ReadLine());
            var tariff = Console.ReadLine();


            if (kilometres < 20 && tariff == "day")
            {
                var fee = 0.79;
                var taxi = 0.70 + fee * kilometres;
                Console.WriteLine($"{taxi:f2}");
            }
            else if (kilometres < 20 && tariff == "night")
            {
                var fee = 0.90;
                var taxi = 0.70 + fee * kilometres;
                Console.WriteLine($"{taxi:f2}");
            }
            else if (kilometres >= 20 && kilometres < 100)
            {
                var bus = 0.09 * kilometres;
                Console.WriteLine($"{bus:f2}");
            }
            else if (kilometres >= 100)
            {
                var train = 0.06 * kilometres;
                Console.WriteLine($"{train:f2}");
            }

        }
    }
}