7
0 27 27 22 18 21 21 
27 0 12 11 13 10 10 
27 12 0 9 17 10 10 
22 11 9 0 14 7 7 
18 13 17 14 0 11 7 
21 10 10 7 11 0 4 
21 10 10 7 7 4 0