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