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