Expression to add properties

I have an object with 3 properties:

I don’t know how to do this, but I need to use the Expression controller (NOT PYTHON!) to add the “value1” and “value2” and apply their sum to the “total” property value. I’ve tried things like:

[Always]-----[Exp: value1 + value2 = total]

This may be very simple that I have not tried it.

The same question was answered yesterday:

Awesome, thanks for the reference!