using System;

public class Program
{
    public static void Main()
    {
        int nights = int.Parse(Console.ReadLine());
        string rooms = Console.ReadLine();
        double price = nights * 70;
        double price1 = nights * 125;
        if(nights <= 10)
        {
            if(rooms == "apartment")
            {
                Console.WriteLine("{0:F2}", price - 0.3 * price);
            }
            else if (rooms == "president apartment")
            {
                Console.WriteLine("{0:F2}", price1 - 0.1 * price1);
            }
        }
        else if (nights >=10 && nights <= 15)
        {
            if (rooms == "apartment")
            {
                Console.WriteLine("{0:F2}", price - 0.35 * price);
            }
            else if (rooms == "president apartment")
            {
                Console.WriteLine("{0:F2}", price1 - 0.15 * price1);
            }
        }
        else if(nights >= 15)
        {

            if (rooms == "apartment")
            {
                Console.WriteLine("{0:F2}", price - 0.50 * price);
            }
            else if (rooms == "president apartment")
            {
                Console.WriteLine("{0:F2}", price1 - 0.20 * price1);
            }
        }
    }
}