rsExtend

local observer = "left"
local rsSwitch = "right"
local xEndstop = "back"
local yEndstop = "bottom"
local rsOut = "top"

local out = 0


while true do
	os.pullEvent("redstone")

	if rs.getInput(xEndstop) then out=3
	elseif rs.getInput(yEndstop) then out=4
	elseif rs.getInput(observer) then out=1
	elseif rs.getInput(rsSwitch) then out=2
	else out=0
	end

	rs.setAnalogOutput(rsOut, out)
end