# This puzzle is solvable
8
 1  2  3  4  5  6  7  8
28 29 30 31 32 33 34  9
27 48 49 50 51 52 35 10
26 47 60 62 63 53 36 11
25 46 59 61 54 55 37 12
24 45 58 57 56 40 38 13
23 44 43 42 18 41 39 14
22 21 20 19 17 16  0 15