def hotel_cost(nights):
return (nights * 140)

def plane_ride_cost(city):
if plane_ride_cost("Charlotte"):
    return (183)
if plane_ride_cost("Tampa"):
    return (220)
if plane_ride_cost("Pittsburgh"):
    return (222)
if plane_ride_cost("Loas Angeles"):
    return (475)

def rental_car_cost(days):
cost = days * 40
if days >= 7:
    cost -= 50
elif days >= 3:
    cost -= 20
return cost

def trip_cost(city, days):
return hotel_cost(nights) + plane_ride_cost(city) + rental_car_cost(days)