#include <iostream>
#include <string>
#include <cmath>

using namespace std;

int main()
{
	int vacantionDays;
	string roomType;
	string evaluation;

	cin >> vacantionDays >> roomType >> evaluation;

	double discount = 0;
	double priceForNight = 0;
															//double totalAmount = 0;

	if (vacantionDays < 10)
	{
		if (roomType == "room for one person")
		{
			priceForNight = 18.00;
		}
		else if (roomType == "apartment")
		{
			priceForNight = 25.00;
			discount = 30;													//30% от крайната цена
		}
		else if (roomType == "president apartment")
		{
			priceForNight = 35.00;
			discount = 10;
		}
	}
	else if (vacantionDays >= 10 && vacantionDays <= 15)
	{
		if (roomType == "room for one person")
		{
			priceForNight = 18.00;
		}
		else if (roomType == "apartment")
		{
			priceForNight = 25.00;
			discount = 35;
		}
		else if (roomType == "president apartment")
		{
			priceForNight = 35.00;
			discount = 15;
		}
	}
	else if (vacantionDays > 15)
	{
		if (roomType == "room for one person")
		{
			priceForNight = 18.00;
		}
		else if (roomType == "apartment")
		{
			priceForNight = 25.00;
			discount = 50;
		}
		else if (roomType == "president apartment")
		{
			priceForNight = 35.00;
			discount = 20;
		}
	}

	double totalAmount = (vacantionDays * priceForNight - priceForNight) * discount;


	/*if (evaluation == "positive")
	{
		totalAmount + totalAmount * 0.25;
	}
	*/


	cout << totalAmount  << endl;










	return 0;
}