HELP! With calculating

Wed Mar 30 04:29:21 EDT 2016

import random
import time
print ("Welcome to Pizza Shed!")
tablenum = input ("Enter table number from 1-25 \n ")
while tablenum>25 or tablenum <=0:
 tablenum = input ("Enter the correct table number, there are only 25 tables ")

#Pizza menu with prices
print ("---------------------")
print ("Let me help you with your order!")
print ("---------------------")
print ("Menu")
print (
 "1 = cheese and tomato: 3.50, "
 "2 = ham and pineapple: 4.20, "
 "3 = vegetarian: 5.20, "
 "4 = meat feast: 5.80, "
 "5 = seafood: 5.60 " )
pizza_choice = input("Enter the type of pizza that you want to order from 1-5 \n")
while pizza_choice>5 or pizza_choice <=1:
 pizza_choice = input ("Enter the right number ")
if pizza_choice == 1:
 print "You have chosen cheese and tomato. The cost for this is 3.50"
elif pizza_choice == 2:
 print ("You have chosen ham and pineapple. The cost for this is 4.20")
elif pizza_choice == 3:
 print ("You have chosen vegetarian. The cost for this is 5.20")
elif pizza_choice == 4:
 print ("You have chosen meat feast. The cost for this is 5.80")
elif pizza_choice == 5:
 print ("You have chosen sea food. The cost for this is 5.60")

print ("------------------")
pizza_amount = input ("Enter the amount of Pizzas that you want to order ")
while pizza_amount > 10 or pizza_amount <=0:
 pizza_amount = input ("Maximum amount is 10, Please enter again ")
print ("--------------------")
#base
print ("Base")
print (
 "1 = thin and crispy,"
 "2 = traditional" )
base = input ("Select a base from 1-2 \n")
while base>2 or base<=1:
 base = input ("There are only 2 types, Please enter again ")
if base == 1:
 print "You have chosen thin and crispy"
elif base == 2:
 print ("You have chosen traditional")

print ("-------------------")
#extra toppings
print ("Extra Toppings")
toppings = input ("Enter a number for your choice of extra topping \n Enter 1 for extra cheese \n Enter 2 for extra pepperoni \n Enter 3 for extra pineapple \n Enter 4 for extra peppers \n" )
while toppings >4 or toppings < 0:
 toppings = input ("There are only 4 types of extra toppings, Please try again " )
if toppings == 1:
 print ("You have chosen extra cheese. The cost for this is 0.50")
elif toppings == 2:
 print ("You have chosen pepperoni. The cost for this is 0.50")
elif toppings == 3:
 print ("You have chosen pineapple. The cost for this is 0.50")
elif toppings == 4:
 print ("You have chosen peppers. The cost for this is 0.50")
print ("-------------------------")
#drink
print ("Drink")
print (
 "1 = Cola: 0.90, "
 "2 = Lemonande: 0.80, "
 "3 = Fizzy Orange: 0.90 " )
drink = input ("Enter a number for your choice of drinks " )
while drink>3 or drink<0:
 drink = input ("Choices start from 0 to 3 " )
if drink == 1:
 print "You have chosen Cola. The cost for this is 0.90"
elif drink == 2:
 print ("You have chosen Lemonande. The cost for this is 0.80")
elif drink == 3:
 print ("You have chosen Fizzy Orange. The cost for this is 0.90")

drink_amount = input ("Enter the amount of drinks")
while drink_amount >10 or drink_amount<0:
 drink_amount = input (" You can only have upto 10 drinks, Please try again")
print ("--------------------------------")
print ("Calculating bill")
print ("--------------------------------")
print ("--------------------------------")

print ("Thank You for ordering at Pizza Shed! ")
Hey, this is my code..
I need to calculate the total cost, but I m not sure how to do that.
I m still new at python.
Can someone please help me