30
23 18 29 16 27 21 24 26 25 30 28 17 22 20 19 
23 27 20 21 30 17 25 28 19 16 22 18 29 26 24 
29 16 26 27 25 23 18 20 22 21 30 19 17 24 28 
20 29 25 21 18 17 23 24 30 26 16 22 28 27 19 
19 26 30 17 16 20 22 23 21 27 28 25 24 29 18 
27 24 17 25 18 21 22 23 29 20 16 30 26 19 28 
30 21 16 22 23 19 20 28 27 17 29 18 24 26 25 
24 18 16 26 22 21 27 17 29 20 25 23 19 30 28 
17 29 22 19 25 20 26 18 21 27 16 23 30 24 28 
16 27 17 18 24 25 19 26 20 28 30 23 29 21 22 
22 18 19 26 21 30 20 28 27 23 24 17 29 25 16 
23 25 19 26 24 18 29 20 27 28 16 22 30 21 17 
18 27 19 16 23 29 22 20 28 26 17 21 25 30 24 
20 24 28 26 18 19 16 21 25 17 27 23 29 30 22 
30 17 28 16 27 22 29 23 19 25 24 18 21 26 20 
12 11 8 13 6 14 5 3 10 9 2 15 7 1 4 
5 2 12 1 11 14 15 13 9 3 8 10 4 6 7 
8 13 2 9 10 4 15 11 5 6 12 3 14 7 1 
5 9 3 10 8 2 13 12 1 4 14 7 6 15 11 
14 12 2 8 5 15 10 4 11 7 6 13 9 3 1 
13 9 10 12 1 5 15 6 8 4 2 7 11 3 14 
10 11 3 8 14 12 7 2 1 15 5 4 6 13 9 
10 15 2 7 14 12 9 6 11 4 3 1 13 5 8 
6 10 13 3 9 1 15 14 8 7 4 11 5 12 2 
12 4 13 1 6 3 15 2 11 5 7 8 10 14 9 
2 13 9 6 1 8 12 11 5 10 4 15 14 7 3 
2 5 3 9 4 13 10 7 12 8 6 15 1 14 11 
4 9 1 2 15 7 13 12 14 8 5 3 11 6 10 
5 1 11 4 9 12 3 13 6 15 2 8 14 10 7 
15 9 6 14 8 2 10 7 4 12 5 3 11 1 13 
forbidden 1 20
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