N, V, SX, SY, GX, GY = gets.split.take(6).map(&:to_i)
MAP = N.times.map{ gets.split.take(N).map(&:to_i) }

def f(start, last)
  visited = N.times.map{[-1]*N}
  visited[start[0]][start[1]] = V
  q = [[0, V] + start]

  res = -1
  while !q.empty?
    step, hp, x, y = q.shift
    if [x, y] == last
      res = step
      break
    end
    [[x+1, y], [x-1, y], [x, y+1], [x, y-1]].each{|a, b|
      next if !a.between?(0, N-1)
      next if !b.between?(0, N-1)
      _hp = hp - MAP[b][a]
      next if _hp < 1
      _step = step + 1
      if visited[a][b] < _hp
        visited[a][b] = _hp
        elem = [_step, _hp, a, b]
        # q[q.bsearch_index{|v|(v <=> elem) < 0}||q.size, 0] = [elem]
        q << elem
      end
    }
  end
  res
end

p f([SX-1, SY-1], [GX-1, GY-1])