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