7
0 26 22 18 12 17 16 
26 0 12 10 14 9 10 
22 12 0 8 16 9 10 
18 10 8 0 12 5 6 
12 14 16 12 0 9 6 
17 9 9 5 9 0 3 
16 10 10 6 6 3 0