Sum of checked checkboxes in table row?

I'm looking for solution, how to dynamically count checked checkboxes in table rows and pass sum of checked to another cell. There is my example:

http://ift.tt/2sxwMM1

I have 10 checkboxes per row and "counter" cell. No idea how to separate checkboxes in rows.

I've found this solution BUT its not working anywhere:

http://ift.tt/2tQfAVW

Thanks for Your attention.