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