Add to numbers using deluge.

Add to numbers using deluge.

Mmm, thought this was going to be easy!
Have created a form called "Add two numbers" added three number fields called
"Number 1", "Number 2" and "Total". I would simply like to add "Number 1" and "Number 2" together and show the answer in "Total"

Similar to this
Total =0
Let Total = Number 1 + Number 2 ................. easy huh?

Except I don't have a clue about syntax in Deluge Script.
Anyone care to throw a pointer?