HELP! With calculating

[Yum Di]

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