run = true
x = 0
y = 0

while true do
	if turtle.detectDown() and y == 0 then
		turtle.up()
		turtle.select(2)
		y = y + 1
	elseif x < 4 then
		turtle.placeDown()
		turtle.forward()
		x = x + 1
	elseif x == 4 and y == 1 then
		turtle.turnRight()
		turtle.forward()
		y = y + 1
	elseif x >= 4 and x < 8 then
		turtle.placeDown()
		turtle.forward()
		x = x + 1
	elseif x == 8 and y == 2 then
		turtle.turnRight()
		turtle.forward()
		y = y + 1
	elseif x >= 8 and x < 12 then
		turtle.placeDown()
		turtle.forward()
		x = x + 1
	elseif x == 12 and y == 3 then
		turtle.turnRight()
		turtle.forward()
		y = y + 1
	elseif x >= 12 and x < 16 then
		turtle.placedown()
		turtle.forward()
		x = x + 1
	elseif x == 15 then
		print("Build should be finished")
		run = false
	else
		print("ERROR")
		run = false
	end

end