[0,0,0,1,1,1,1,1,2,2,2,3,3,3,3,3,3,4,4,5,5,5,5,5, 6,6,6,7,7,7,7,7,7,7,7,8,8,8,8,8,8,8,8,9,10,10,10, 10,11,12,12,13,13,13,13,13,13,13,13,14,14,14,15, 15,15,15,15,16,16,16,16,16,16,16,17,18,18,18,18, 18,18,18,18,19]