H, W = gets.split.map(&:to_i)
G = Array.new(H) { Array.new(W, 0) }

(H - 1).times do |y|
  (W - 1).times do |x|
    cnt = 0
    cnt += 1 if G[y][x] == 0
    cnt += 1 if G[y][x + 1] == 0
    cnt += 1 if G[y + 1][x] == 0
    cnt += 1 if G[y + 1][x + 1] == 0

    if cnt > 2
      G[y][x] ^= 1
      G[y][x + 1] ^= 1
      G[y + 1][x] ^= 1
      G[y + 1][x + 1] ^= 1
    end
  end
end

ans = G.map { |row| row.count(1) }.sum
puts ans
puts G.map { |row| row.join(' ') }