season = input()
km_per_month = float(input())

total_km = km_per_month * 4
total_earned = 0

if km_per_month <= 5000:
    if season == "Winter":
        total_earned = 1.05 * total_km
    elif season == "Summer":
        total_earned = 0.9 * total_km
    else:
        total_earned = 0.75 * total_km

elif 5000 < km_per_month <= 10000:
    if season == "Winter":
        total_earned = 1.25 * total_km
    elif season == "Summer":
        total_earned = 1.1 * total_km
    else:
        total_earned = 0.95 * total_km

elif 10000 < km_per_month <= 20000:
    total_earned = 1.45 * total_km

total_earned *= 0.9

print(f"{total_earned:.2f}")