Needing a formular to calculate fixed fields

I have a scale of depression form that needs to total at the bottom all the selections to questions in the tinted area which are either a 'one' or a 'two' to give a score on the depression scale. The user can only select one choice on each row of course. 'A' and 'O' will be zero. Will use tick/highlighted boxes to select either one or two (not enter a number) to get a total at the bottom for a scaling. How do I go about this and what would be the formulas for doing this.

Hope this is clear. Thanks.