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