# This puzzle is solvable
9
 1  2  3  4  5  6  7  8  9
32 33 34 35 36 37 38 39 10
31 56 57 58 59 60 61 40 11
30 55 72 73 74 75 62 41 12
29 54 71 80 78 76 63 42 13
28 53 70 79 77 66 64 43 14
27 52 69 68 65 47 46 44 15
26 51 50 49 67 21 19 45 16
25 24 23 22 48 20  0 18 17