H, W = gets.split.map(&:to_i)

grid = Array.new(H) { [0] * W }

(H / 2 * 2).times do |i|
  (W / 2 * 2).times do |j|
    grid[i][j] = 1
  end
end
if H == 1 or W == 1
  puts 0
elsif H.even? or W.even?
  puts (H / 2 * 2) * (W / 2 * 2)
else
  puts (H / 2 * 2) * (W / 2 * 2) + 2
  (H - 2 ... H).each do |i|
    (W - 2 ... W).each do |j|
      grid[i][j] ^= 1
    end
  end
end

puts grid.map { |row| row * " " }