7
0 30 29 23 18 22 22 
30 0 15 13 16 12 12 
29 15 0 10 17 11 11 
23 13 10 0 13 7 7 
18 16 17 13 0 10 6 
22 12 11 7 10 0 4 
22 12 11 7 6 4 0