6 10
  1  0  2  0  0  0  3  0  3  0
  0  2  0  0  0  0  0  0  0  4
  1  0  4  0  0  0  0  0  0  0
  1  0  0  0  0  0  0  0  0  0
  0  0  0  4  0  2  0  2  0  0
  1  0  0  0  1  0  1  3  0  0