Sand terraformer

count = 128
moveDown = 0
slot = 1
turtle.select(4)
turtle.refuel(16)
turtle.select(1)
while(count > 0) do
	if(turtle.getItemCount(slot)<5) then
		slot = slot + 1
		turtle.select(slot)
	end
	while(turtle.detectDown()==false) do
		turtle.placeDown()
		os.sleep(0.5)
	end
	if(turtle.compareDown()==false) then
		turtle.digDown()
		turtle.placeDown()
	end
	if (turtle.detect()) then
		turtle.dig()
		os.sleep(0.3)
		if (turtle.detect()) then
			turtle.dig()
			os.sleep(0.3)
			if (turtle.detect()) then
				turtle.dig()
				os.sleep(0.3)
				if (turtle.detect()) then
					turtle.dig()
					os.sleep(0.3)
				end
			end
		end
		turtle.forward()
	end
	if (turtle.detectUp()) then
		turtle.digUp()
		turtle.up()
		moveDown = moveDown + 1
		if (turtle.detectUp()) then
			turtle.digUp()
			turtle.up()
			moveDown = moveDown + 1
			if (turtle.detectUp()) then
				turtle.digUp()
				turtle.up()
				moveDown = moveDown + 1
				if (turtle.detectUp()) then
					turtle.digUp()
					turtle.up()
					moveDown = moveDown + 1
				end
				if (turtle.detectUp()) then
					turtle.digUp()
					turtle.up()
					moveDown = moveDown + 1
				end
				if (turtle.detectUp()) then
					turtle.digUp()
					turtle.up()
					moveDown = moveDown + 1
				end
				if (turtle.detectUp()) then
					turtle.digUp()
					turtle.up()
					moveDown = moveDown + 1
				end
				if (turtle.detectUp()) then
					turtle.digUp()
					turtle.up()
					moveDown = moveDown + 1
				end
				if (turtle.detectUp()) then
					turtle.digUp()
					turtle.up()
					moveDown = moveDown + 1
				end
				if (turtle.detectUp()) then
					turtle.digUp()
					turtle.up()
					moveDown = moveDown + 1
				end
				if (turtle.detectUp()) then
					turtle.digUp()
					turtle.up()
					moveDown = moveDown + 1
				end
				if (turtle.detectUp()) then
					turtle.digUp()
					turtle.up()
					moveDown = moveDown + 1
				end
				if (turtle.detectUp()) then
					turtle.digUp()
					turtle.up()
					moveDown = moveDown + 1
				end
				if (turtle.detectUp()) then
					turtle.digUp()
					turtle.up()
					moveDown = moveDown + 1
				end
				if (turtle.detectUp()) then
					turtle.digUp()
					turtle.up()
					moveDown = moveDown + 1
				end
				if (turtle.detectUp()) then
					turtle.digUp()
					turtle.up()
					moveDown = moveDown + 1
				end
			end
		end
	end
	while(moveDown>0) do
		turtle.down()
		moveDown = moveDown - 1
	end
	turtle.forward()
	count = count - 1
end