Numbers reshape the noun that follows them. Pick the noun form that agrees with the number shown. The deck reshuffles every time, so the order is never the same twice.
Watch the traps: 11/12/13/14 pasa (not paucal), 21 pas (singular again), 22/23/24 psa (paucal again). The rule keys off the last two digits, so 1001 still takes the singular: 1001 pas.