16.

#include <iostream>
#include <string>
using namespace std;

int main()
{
    double distance;
    string time_of_day;

    cin >> distance;
    cin >> time_of_day;


    double taxi_initial_price = 0.7;
    double taxi_day_price = 0.79;
    double taxi_night_price = 0.9;
    double bus = 0.09;
    double train = 0.06;

    if (distance >= 100)
    {
        //Train
        cout << distance * train << endl;
    }
    else if (distance >= 20)
    {
        //Bus
        cout << distance * bus << endl;
    }
    else
    {
        //Taxi
        if (time_of_day == "day")
        {
            cout << taxi_initial_price + distance * taxi_day_price << endl;
        }
        else if (time_of_day == "night")
        {
            cout << taxi_initial_price + distance * taxi_night_price << endl;
        }
    }
    return 0;
}