length = read("*n")
width = read("*n")

for i = 1, width, 1 do
  for j = 1, length, 1 do
    while turtle.getFuelLevel() < 1 do
      turtle.refuel()
      os.sleep(0.05)
    end
    while turtle.dig() do
    end
    turtle.forward()
    height = 0
    while turtle.detectUp() do
      turtle.digUp()
      if turtle.up() then
        height = height + 1
      end
    end
    for k = height, 0, -1 do
      turtle.down()
    end
  end
  if i % 2 == 1 then
    turtle.turnLeft()
  else
    turtle.turnRight()
  end
  while turtle.dig() do
  end
  turtle.forward()
  if i % 2 == 1 then
    turtle.turnLeft()
  else
    turtle.turnRight()
  end
end