In reply to Lankyman:
well I remember early climbing days at Swanage where a friend who had a huge rack ran out of gear on one of the severes at Subluminal - we had to lower a toprope!
He went on to be a professor of Botany in the US.
So probably n+1
and I seem to remember a shortage of the smaller sized nuts was a bit of a drawback there.
Post edited at 19:27