18. Challenge build pizza calculator

18.1 Challenge - build pizza calculator

There is a pizza restaurant. Given below is their menu.

veggie pizza : $7
chicken pizza : $10
cookies : $3

Write a program that will ask following questions.

How many veggie pizza you need ?
How many chicken pizza you need ?
How many cookies you need ?

Then the program should print total cost.

Total cost of your order is xxxxx.