distance = int(input())
day_or_night = input()
price = 0.00

if day_or_night == "Day":
    taxi_rate = 0.79
else:
    taxi_rate = 0.90

if distance < 20:
    price = 0.70 + taxi_rate * distance

if distance >= 20 and distance <= 100:
    price = distance * 0.09

if distance >= 100:
    price = distance * 0.06


print("%.2f" % price)