7
0 26 26 22 16 20 21 
26 0 12 10 14 10 9 
26 12 0 8 16 10 9 
22 10 8 0 12 6 5 
16 14 16 12 0 10 7 
20 10 10 6 10 0 3 
21 9 9 5 7 3 0