local tArgs = { ... }

if #tArgs == 0 then
	blocksToMine = 20
else
	local blocksToMine = tonumber(tArgs[1])
end

function upDown()
	turtle.digUp()
	turtle.digDown()
end

function forward()
	while not turtle.forward() do
		if not turtle.dig() then
			turtle.attack()
		end
	end
end

for i=1,blocksToMine do
	upDown()
	turtle.dig()
	forward()
end

for i=1,2 do
	turtle.turnLeft()
end

for i=1,blocksToMine do
	forward()
end

turtle.turnLeft()
for i=1,4 do
	turtle.forward()
end
turtle.turnLeft()