Problem adding cells with alpha characters

I have a form that I need to do and I am stuck with the format that it is in and I cannot seem to make it do what I need it to do!

I am attaching a sample of what I have and what it needs to do. Essentially it needs to add a series of cells across a row however the format is odd (S 6.5) as an example and it needs to skip cells where there is a weekend.
Any help would be tremendously appreciated!!

Thanks, but "s" has 5 different values on my form (5, 6, 6.5, 7.25, 7.75) and I'm not sure how you'd get that formula to count multiple values for both "s" and "v"...