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

namespace Transport
{
    class Program
    {
        static void Main(string[] args)
        {
            var n = double.Parse(Console.ReadLine());
            var part = Console.ReadLine();


            if (n < 20 && part == "day")
            {
                Console.WriteLine((n * 0.79) + 0.70);
            }
            else if (n < 20 && part == "night")
            {
                Console.WriteLine((n * 0.90) + 0.70);
            }
            else if (n >= 20 && n < 100)
            {
                Console.WriteLine(n * 0.09);
            }
            else if (n >= 100)
            {
                Console.WriteLine(n * 0.06);
            }
            else
            {
                Console.WriteLine("Incorrect input");
            }
        }
    }
}