Adding up the top 8 values

Morning,

I posted an earlier query asking how to work out the average value from the highest 8 values from a row of 12. The boss has now said we don't need an average just a total

In cell Q2, I would like it to look at all the values in cells in B2 to N2, and then add up the highest 8 scores; if there are less than 8 values, I would like it to add up what there is.

Any help would be appreciated.

Many thanks