function refuel()
	turtle.select(2)
	local flag = turtle.refuel(1)
	turtle.select(1)
	return flag
end

function repeatAction(funct)
	while not funct() do
		if(turtle.getFuelLevel() < 5) then
			refuel()
		end
		os.sleep(1)
	end
	return true
end

os.sleep(1)
repeatAction(refuel)
turtle.select(1)
if(turtle.getItemCount(1) == 0) then
	turtle.select(1)
	repeatAction(turtle.digDown)
end

while true do
	if(turtle.getFuelLevel() < 5) then
		refuel()
	end

	if not turtle.detect() then
		while not turtle.forward() do
			turtle.dig()
			if(turtle.getFuelLevel() < 5) then
				refuel()
			end
		end
	elseif turtle.dig() then
		while not turtle.forward() do
			turtle.dig()
			if(turtle.getFuelLevel() < 5) then
				refuel()
			end
		end

		turtle.digUp()
		turtle.digDown()
		while not turtle.placeDown() do
			turtle.digDown()
		end
		for i=3, 16 do
			turtle.select(i)
			turtle.dropDown()
		end
		turtle.select(1)
		turtle.digDown()
	else
		os.shutdown()
	end
end