[1,1,2,2,3,3,4,5,5,6,6,8,8,9,9,11,11,13,12,14,14, 15,15,18,17,19,18,20,20,22,21,25,23,26,25,28,26, 29,27,31,29,32,31,34,33,35,34,38,35,41,37,42,40, 43,41,45,42,46,44,48,45,50,46,52,49,53]