05. Small Shop

# продукт -> text
# град -> text
# количество -> float
# ед.цена -> зависи от продукт и град
# крайна цена = количество * ед. цена
product = input()
town = input()
quantity = float(input())

price_per_product = 0 # ед.цена

if town == "Sofia":
    # проверка кой е продуктът
    if product == "coffee":
        price_per_product = 0.50
    elif product == "water":
        price_per_product = 0.80
    elif product == "beer":
        price_per_product = 1.20
    elif product == "sweets":
        price_per_product = 1.45
    elif product == "peanuts":
        price_per_product = 1.60
elif town == "Plovdiv":
    # проверка кой е продуктът
    if product == "coffee":
        price_per_product = 0.40
    elif product == "water":
        price_per_product = 0.70
    elif product == "beer":
        price_per_product = 1.15
    elif product == "sweets":
        price_per_product = 1.30
    elif product == "peanuts":
        price_per_product = 1.50
elif town == "Varna":
    # проверка кой е продуктът
    if product == "coffee":
        price_per_product = 0.45
    elif product == "water":
        price_per_product = 0.70
    elif product == "beer":
        price_per_product = 1.10
    elif product == "sweets":
        price_per_product = 1.35
    elif product == "peanuts":
        price_per_product = 1.55


# знаем единичната цена за продукта
final_price = quantity * price_per_product
print(final_price)