[0,1,1,2,3,4,4,5,5,6,6,7,8,9,9,10,11,12,12,13,14, 15,15,16,16,17,17,18,19,20,20,21,21,22,22,23,24, 25,25,26,26,27,27,28,29,30,30,31,32,33,33,34,35, 36,36,37,37,38,38,39,40,41,41,42,43,44,44,45,46, 47,47,48,48,49,49,50,51,52,52,53,54]