7
0 26 27 23 16 21 21 
26 0 11 9 14 9 9 
27 11 0 8 17 10 10 
23 9 8 0 13 6 6 
16 14 17 13 0 11 7 
21 9 10 6 11 0 4 
21 9 10 6 7 4 0