[Plugin: Contact Form 7] Calculate text form fields

Is there a way to use contact form 7 to sum up form fields.
I’m trying to create a small estimator that could then be sent to me by email.

I’ve tried “price calc” but no multi-language support, plus the script is no longer supported.

Here is a small exemple of what I wish to achive.
2 part submit

1st the small estimator

Number of people _ x 12 = ?
Number of people on dance floor _ * 10 = ?
Total = ?
[submit]

2nd part
Usual contact form”
Name
Number
email
[submit]

https://www.ads-software.com/extend/plugins/contact-form-7/