[Zope] How to calculate variables using DTML

[Alexander Alvarado]

Hi I just want to create a new variable adding some other vatiables, 
something like:

TTP= ( T_ADT + T_SRC + T_CHD)*TT_NITES

As I recieve this variables from a previous form I guess I have to convert 
them into integer I thought that <dtml-set 
TTP="(_.int(ADT)+_.int(CHD)+_.int(SRC)*(_.int(TT_NITES))"> would work, but 
it does not.

Hoe can I do this?

Thanks !!!!!!!!!!!!!!!!!!!!!!!!!

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