7
0 6 6 4 4 4 5 
6 0 0 2 2 2 1 
6 0 0 2 2 2 1 
4 2 2 0 2 2 1 
4 2 2 2 0 2 1 
4 2 2 2 2 0 1 
5 1 1 1 1 1 0