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