local args = { ... }

function select(name)
	for i = 1, 16 do
		local detail = turtle.getItemDetail(i)
		if detail ~= nil and detail.name == name then
			turtle.select(i)
		end
	end
end

function buildLayer()
	for i = 1, 6 do
		for j = 1, 6 do
			select("minecraft:cobblestone_slab")
			turtle.placeDown()
			turtle.up()
			select("minecraft:sand")
			turtle.placeDown()
			turtle.up()
			select("minecraft:cactus")
			turtle.placeDown()
			if j ~= 6 then
				turtle.forward()
				turtle.forward()
				turtle.down()
				turtle.down()
			end
		end
		if i ~= 6 then
			if i % 2 == 0 then
				turtle.turnRight()
				turtle.forward()
				turtle.forward()
				turtle.down()
				turtle.down()
				turtle.turnRight()
			else
				turtle.turnLeft()
				turtle.forward()
				turtle.forward()
				turtle.down()
				turtle.down()
				turtle.turnLeft()
			end
		end
	end

	select("minecraft:spruce_fence")

	turtle.up()
	turtle.turnLeft()
	turtle.forward()
	turtle.turnLeft()

	for i = 1, 3 do
		for j = 1, 6 do
			turtle.placeDown()
			if j ~= 6 then
				turtle.forward()
				turtle.forward()
			end
		end
		if i ~= 3 then
			if i % 2 == 0 then
				turtle.turnLeft()
				turtle.forward()
				turtle.forward()
				turtle.forward()
				turtle.forward()
				turtle.turnLeft()
			else
				turtle.turnRight()
				turtle.forward()
				turtle.forward()
				turtle.forward()
				turtle.forward()
				turtle.turnRight()
			end
		end
	end
end

for i = 1, args[1] do
	buildLayer()
	turtle.back()
	turtle.back()
	turtle.back()
	turtle.back()
	turtle.back()
	turtle.back()
	turtle.back()
	turtle.back()
	turtle.back()
	turtle.back()
	turtle.up()
	turtle.turnRight()
	turtle.forward()
	turtle.turnLeft()
end

turtle.back()
turtle.back()
turtle.back()
turtle.back()

while turtle.down() do
end