7
0 23 22 16 13 17 16 
23 0 11 11 12 8 9 
22 11 0 8 15 7 8 
16 11 8 0 13 5 6 
13 12 15 13 0 10 7 
17 8 7 5 10 0 3 
16 9 8 6 7 3 0