transport_price

distance_km = int(input()) # растояние за пътуване
day_or_night = input()      # дали ще пътува през деня или през ноща
min_sum = 0.00
taxi_day = 0.70 + distance_km * 0.79
taxi_night = 0.70 + distance_km * 0.90
autobus = distance_km * 0.09 # Само око растоянието е >= 20 км
train = distance_km * 0.06      # Само ако растоянието е >= 100 км

if distance_km < 20 and day_or_night == "day":
    print(f"{taxi_day:.2f}")
elif distance_km < 20 and day_or_night == "night":
    print(f"{taxi_night:.2f}")
elif 20 <= distance_km < 100 and day_or_night == "day":
    if taxi_day > autobus:
        print(f"{autobus:.2f}")
    elif taxi_day < autobus:
        print(f"{taxi_day:.2f}")
    else:
        print(f"{autobus:.2f}")
elif 20 <= distance_km < 100 and day_or_night == "night":
    if taxi_night > autobus:
        print(f"{autobus:.2f}")
    elif taxi_night < autobus:
        print(f"{taxi_night:.2f}")
    else:
        print(f"{autobus:.2f}")
elif distance_km >= 100 and day_or_night == "day":
    list_of_transport_day = [taxi_day, autobus, train]
    min_sum = min(list_of_transport_day)
    print(f"{min_sum:.2f}")
elif distance_km >= 100 and day_or_night == "night":
    list_of_transport_night = [taxi_night, autobus, train]
    min_sum = min(list_of_transport_night)
    print(f"{min_sum:.2f}")