pizza menu

#PIZZA MENU
print("Welcome to Python Pizza Deliveries!")
size = input("What size pizza do you want? S, M, or L ")
add_pepperoni = input("Do you want pepperoni? Y or N ")
extra_cheese = input("Do you want extra cheese? Y or N ")
cheese=1
pizza=0
pepperoni=0
bill=0
if size=="S":
  pizza+=15
  if add_pepperoni=="Y":
    pepperoni+=2
    if extra_cheese=="Y":
      bill=pizza+pepperoni+cheese
      print("Your final bill is $",bill)
    else:
      bill=pizza+pepperoni
      print("Your final bill is $",bill)
  else:
    if extra_cheese=="Y":
      bill=pizza+cheese
      print("Your final bill is $",bill)
    else:
      bill=pizza
      print("Your final bill is $",bill)
elif size=="M":
  pizza+=20
  if add_pepperoni=="Y":
    pepperoni+=3
    if extra_cheese=="Y":
      bill=pizza+pepperoni+cheese
      print("Your final bill is $",bill)
    else:
      bill=pizza+pepperoni
      print(bill)
  else:
    if extra_cheese=="Y":
      bill=pizza+cheese
      print("Your final bill is $",bill)
    else:
      bill=pizza
      print("Your final bill is $",bill)
else:
  pizza+=25
  if add_pepperoni=="Y":
    pepperoni+=2
    if extra_cheese=="Y":
      bill=pizza+pepperoni+cheese
      print("Your final bill is $",bill)
    else:
      bill=pizza+pepperoni
      print("Your final bill is $",bill)
  else:
    if extra_cheese=="Y":
      bill=pizza+cheese
      print("Your final bill is $",bill)
    else:
      bill=pizza
      print("Your final bill is $",bill)