Need some help!

I'm working on an excel sheet that works through people’s daily, weekly hrs worked. Mon = 8, Tues = 8, Wed = 8 and so on.

If a person takes a day off or a holiday, say Monday, then two other guys pick up a 12hr pattern, days & nights. The extra 4hrs worked is now extra hrs and classed as banked.
The sheet consists 52 weeks and is also used to book holidays in the future weeks to come and where then adjusted to suit the 12hr pattern.

So, through the weeks I'm already doing a total summing of the extra 4hrs year to date per person - What I looking for is a way to show me how many extra hours a person as worked so far and depending on how many weeks has gone by. eg. If a person worked 16hrs off his banked in 11 weeks, im looking for a cell to show me 16 hrs. At the minute the sheet shows me 100's of hrs per person because the sheet has been adjusted for future weeks to suit holidays to come.

I hope you understand what I'm trying to achieve here..? Its kinda wrote down like this?
if cell A1 = 11 (weeks) then total cell wk1, cell wk2, and so on to cell wk11 = 16 or what eva it may be.

Thanks for any help
Mike