Choice influence on the price – Contact Form 7

Hello everyone,
I’m posting on this forum for the first time and here is my question.
I’m using contact form 7 for inscription of people for an event. And during this event they will have to choose different option that may change the price of this event. So what I would like to know is, is it possible that they check some boxes, (for example 3 options (1 day hosting=5€, 2 days hosting=10€, 3 days hosting=15€) and the same for food) Let’s say someone is taking 2 days of hosting and 1 of food, it would cost 15€. How could I possibly display this price at the end when the customer press submit on a popup asking him if he is sure, and if yes send me a normal mail with price and details on the subscription.

I didn’t know how to look for it by myself, that’s why I’m asking you here. Thanks in advance for your time and consideration.