sleeper...
1,4,9,12,17,20,25,28,33,36,41,44,49,52,57,60,65,68...lb
2,5,10,13,18,21,26,29,34,37,42,45,50,53,58,61,66,69...mb
3,6,11,14,19,22,27,30,35,38,43,46,51,54,59,62,67,70...ub
7,15,23,31,39,47,55,63,71...side lower
8,16,24,32,40,48,56,64,72...side...
more... upper
which berth is yours?