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