mtree

os.loadAPI("mapi")
dir = true
count = 1
while true do
  turtle.select(2)
  while not turtle.compare() do
    turtle.select(4)
    turtle.place()
    turtle.select(2)
  end
  if turtle.getFuelLevel() < 2000 then
    turtle.select(1)
    if turtle.getItemCount() < 64 then
      for i=5,16 do
        turtle.select(i)
        turtle.transferTo(1)
      end
      for i=5,16 do
        turtle.select(i)
        turtle.transferTo(3)
      end
    end
    turtle.select(1)
    turtle.refuel(turtle.getItemCount()-1)
  end
  turtle.select(5)
  mapi.forward(1,true)
  up = mapi.clearUp()
  mapi.down(up)
  mapi.suck()
  while not turtle.back() do end
  turtle.select(3)
  turtle.place()
  if dir then
    mapi.turnRight()
    mapi.forward(6)
    mapi.turnLeft()
  else
    mapi.turnLeft()
    mapi.forward(6)
    mapi.turnRight()
  end
  count = count + 1
  if count % 3 == 0 then
    dir = not dir
    count = 1
  end
  if count == 1 and dir then
    while not turtle.back() do end
    mapi.turnRight(2)
    for i=5,16 do
      turtle.transferTo(1)
    end
    mapi.empty(4)
    mapi.turnRight(2)
    mapi.forward()
  end
end