7
0 8 8 5 6 6 7 
8 0 0 3 2 2 1 
8 0 0 3 2 2 1 
5 3 3 0 3 3 2 
6 2 2 3 0 2 1 
6 2 2 3 2 0 1 
7 1 1 2 1 1 0