Efficiency

Level 5 of the Dungeon
(0, 0, D:5)
  20 arrows

Level 6 of the Dungeon
(6, -1, D:6)
  28 stones (still there?)
  an adder corpse (still there?)
(11, 5, D:6)
  a scroll of identify
(14, -7, D:6)
  a scroll of brand weapon

Level 7 of the Dungeon
(0, 0, D:7)
  12 gold pieces