A number of KMCers (nk) did a number of climbs (nc) made up of different numbers of pitches (np). The equipment used on each ascent included a number of ropes (nr) and items of gear (ng). Towards the end of the evening there were a number of midges (nm) in addition to some flying ants (na). At this point the climbers retreated to the Pub for a number of drinks (nd). Given that: nk ≈ 7 nc > 5 1 ≤ np ≤ 2 0 ≤ nr ≤ 2 ng ≥ 0 nm → ∞ na < nm calculate nd