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