7
0 29 29 23 16 21 21 
29 0 14 12 17 12 12 
29 14 0 8 17 10 10 
23 12 8 0 13 6 6 
16 17 17 13 0 11 7 
21 12 10 6 11 0 4 
21 12 10 6 7 4 0