# Ask the user the required info
nr_people = raw_input("How many people are coming to your party?") # people
pizza = raw_input("What's the price of pizza?") # pizza price
juice = raw_input("What's the price of juice?") # juice price

# Now you have to convert to int or float
# people to int
# and prices to float, because they can be 10.5 or 2.43
nr_people = int(nr_people)
pizza = float(pizza)
juice = float(juice)

# store the result
result = nr_people * pizza + nr_people * juice * 2

# convert the result to str
result = str(result)

# print everything
print "You have to pay " + result + " dollars."