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