7
0 28 27 22 17 23 22 
28 0 13 12 15 9 10 
27 13 0 9 16 8 9 
22 12 9 0 13 5 6 
17 15 16 13 0 10 7 
23 9 8 5 10 0 3 
22 10 9 6 7 3 0