SkiTrip

allDayStay = int(input())
room = input()
grade = input()
roomSum = 0
discount = 0
while True:
    if room == 'room for one person':
        roomSum = 18.00
        personSum = (allDayStay - 1) * roomSum
        if grade == 'positive':
            discount = personSum + (personSum * 0.25)
            print(f"{discount:.2f}")
            break
        else:
            if grade == 'negative':
                discount = personSum - (personSum * 0.10)
                print(f"{discount:.2f}")
                break
    if room == 'apartment':
        roomSum = 25.00
        apartSum = (allDayStay - 1) * roomSum
        if allDayStay <= 10:
            discount = apartSum - (apartSum * 0.30)
        elif allDayStay <= 15:
            discount = apartSum - (apartSum * 0.35)
        elif allDayStay > 15:
            discount = apartSum - (apartSum * 0.50)
        if grade == 'positive':
            discount += discount * 0.25
            print(f"{discount:.2f}")
            break
        else:
            if grade == 'negative':
                discount -= discount * 0.10
                print(f"{discount:.2f}")
                break
    if room == 'president apartment':
        roomSum = 35.00
        presidSum = (allDayStay - 1) * roomSum
        if allDayStay <= 10:
            discount = presidSum - (presidSum * 0.10)
        elif allDayStay <= 15:
            discount = presidSum - (presidSum * 0.15)
        elif allDayStay > 15:
            discount = presidSum - (presidSum * 0.20)
        if grade == 'positive':
            discount += discount * 0.25
            print(f"{discount:.2f}")
            break
        else:
            if grade == 'negative':
                discount -= discount * 0.10
                print(f"{discount:.2f}")
                break