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