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