Torches

function Forward(k)
        for i = 1, k do

		while turtle.detect() do
		turtle.turnLeft()
		end

	turtle.forward()
	turtle.forward()
	turtle.forward()
	turtle.forward()
   	turtle.placeDown()
	end
end

turtle.select(1)
turtle.refuel(1)
turtle.select(2)

k = 64
Forward(k)