Small Shop

item = input().lower()
town = input().lower()
quantity = float(input())

if town == "sofia":
  if item == "coffee":
    print(quantity * 0.50)
  elif item == "water":
    print(quantity * 0.80)
  elif item == "beer":
    print(quantity * 1.20)
  elif item == "sweets":
    print(quantity * 1.45)
  elif item == "peanuts":
    print(quantity * 1.60)

if town == "plovdiv":
  if item == "coffee":
    print(quantity * 0.40)
  elif item == "water":
    print(quantity * 0.70)
  elif item == "beer":
    print(quantity * 1.15)
  elif item == "sweets":
    print(quantity * 1.30)
  elif item == "peanuts":
    print(quantity * 1.50)

if town == "varna":
  if item == "coffee":
    print(quantity * 0.45)
  elif item == "water":
    print(quantity * 0.70)
  elif item == "beer":
    print(quantity * 1.10)
  elif item == "sweets":
    print(quantity * 1.35)
  elif item == "peanuts":
    print(quantity * 1.55)