[0,1,1,2,3,3,4,4,4,5,5,5,6,6,6,7,7,7,7,8,8,8,9,9, 9,9,9,9,9,9,9,10,11,11,11,11,11,11,11,12,12,12,12, 12,12,13,13,13,13,14,14,14,15,15,15,16,16,16,16, 16,16,17,17,18,19,20,20,20,20,20,20,20,20,20,20, 20,20,20,20,21,21,21,21,21,21,21,21]