while true do
  refill()
  gototop()
  build()
  godown()
end


function gototop()
	while turtle.detect() do
		turtle.up()
	end
	-- body
end
function godown()
	while turtle.detectDown() do
    turtle.down()
  end
end

function build()
  turtle.up()
  turtle.forward()
  turtle.placeDown()
  turtle.turnLeft()
  turtle.forward()
  turtle.placeDown()
  turtle.forward()
  turtle.placeDown()
  turtle.forward()
  turtle.turnRight()
  turtle.forward()
  turtle.placeDown()
  turtle.forward()
  turtle.placeDown()
  turtle.forward()
  turtle.placeDown()
  turtle.forward()
  turtle.placeDown()
  turtle.forward()
  turtle.placeDown()
  turtle.forward()
  turtle.turnRight()
  turtle.forward()
  turtle.placeDown()
  turtle.forward()
  turtle.placeDown()
  turtle.forward()
  turtle.placeDown()
  turtle.forward()
  turtle.placeDown()
  turtle.forward()
  turtle.placeDown()
  turtle.forward()
  turtle.turnRight()
  turtle.forward()
  turtle.placeDown()
  turtle.forward()
  turtle.placeDown()
  turtle.forward()
  turtle.placeDown()
  turtle.forward()
  turtle.placeDown()
  turtle.forward()
  turtle.placeDown()
  turtle.forward()
  turtle.turnRight()
  turtle.forward()
  turtle.placeDown()
  turtle.forward()
  turtle.placeDown()
  turtle.turnLeft()
  turtle.forward()
  turtle.down()
  turtle.turnRight()
  turtle.forward()
  turtle.turnRight()
  if turtle.getItemCount(1) then
    build()
  end
end



function refill()
  turtle.select(1)
  remaining=turtle.getItemSpace()
  turtle.suckDown(remaining)
  turtle.turnLeft()
  turtle.forward()
  turtle.forward()
  turtle.select(16)
  remaining=turtle.getItemSpace()
  turtle.suckDown(remaining)
  turtle.turnRight()
  turtle.turnRight()
  turtle.forward()
  turtle.forward()
  turtle.turnLeft()
  turtle.select(1)
end