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