7
0 27 27 22 16 21 21 
27 0 14 11 15 10 10 
27 14 0 9 17 10 10 
22 11 9 0 12 5 5 
16 15 17 12 0 11 7 
21 10 10 5 11 0 4 
21 10 10 5 7 4 0