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