local tArgs = {...}
torchSlot = 16

local blocksToMine = 0
local torchCounter = 0
local torchSpacing = 15

if #tArgs == 0 then
	blocksToMine = 20
else
	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()
	torchCounter = torchCounter + 1
	if torchCounter % torchSpacing == 0 then
		turtle.select(torchSlot)
		turtle.placeDown()
		turtle.select(1)
	end
	turtle.dig()
	forward()
end

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

for i=1,blocksToMine do
	forward()
end

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