05. Small Shop

product = input() # coffee	water	beer sweets	peanuts
town = input() # Sofia, Plovdiv, Varna
quantity = float(input()) # количество

# крайна цена = количество * ед. цена
price = 0.0 # ед. цена на продукта

if town == "Sofia":
    # проверка за продукта
    if product == "coffee":
        price = 0.50
    elif product == "water":
        price = 0.80
    elif product == "beer":
        price = 1.20
    elif product == "sweets":
        price = 1.45
    elif product == "peanuts":
        price = 1.60

elif town == "Plovdiv":
    # проверка за продукта
    if product == "coffee":
        price = 0.40
    elif product == "water":
        price = 0.70
    elif product == "beer":
        price = 1.15
    elif product == "sweets":
        price = 1.30
    elif product == "peanuts":
        price = 1.50

elif town == "Varna":
    # проверка за продукта
    if product == "coffee":
        price = 0.45
    elif product == "water":
        price = 0.70
    elif product == "beer":
        price = 1.10
    elif product == "sweets":
        price = 1.35
    elif product == "peanuts":
        price = 1.55

# единичната цена на продукта спрямо града
final_price = quantity * price
print(final_price)