CheapestTransport

import java.util.Scanner;
import java.lang.String;

public class Transport {
    public static void main(String[] args) {
        Scanner console = new Scanner(System.in);

        double km = Double.parseDouble(console.nextLine());
        String onTime = console.nextLine().toLowerCase();

        double taxiDay = 0.70 + ( km * 0.79);
        double taxiNight = 0.70 + ( km * 0.90);
        double bus = km * 0.09;
        double train = km * 0.06;

        if( km > 0 && km <= 20) {
            if(onTime.equals("day")) {
                System.out.printf("%.2f", taxiDay);
             }else if(onTime.equals("night")){
                System.out.printf("%.2f", taxiNight);
            }
        }else if( km > 20 && km <=100){
            if(onTime.equals("day") || onTime.equals("night")) {
                System.out.printf("%.2f", bus);
            }
        }else if( km > 100 ){
            if(onTime.equals("day") || onTime.equals("night")) {
                System.out.printf("%.2f", train);
            }
        }
    }
}