webform submission message theming

Customization of the webform submission message.
1. You need to copy this template into the theme folder
http://floomby.ru/content/HsPR5nXPgE
2. Next, you need to separate the code for other messages from the webform and the one that needs to be calculated.
 This should be done using a switch conditional operator
http://php.net/manual/en/control-structures.switch.php
3. By default, keep the existing code, create your own template for the webform with calculations, and
multiply the quantity and price fields.
I can't understand how to assign the variable $price to the price field when creating it so that it can be displayed in the template?