[1,1,1,2,2,2,3,3,4,4,4,5,5,5,6,6,7,7,7,8,8,8,9,9, 10,10,10,11,11,11,12,12,13,13,13,14,14,15,15,15, 16,16,16,17,17,18,18,18,19,19,19,20,20,21,21,21, 22,22,23,23,23,24,24,24,25,25,26,26,26,27,27,28]