snad

function flash()
    redstone.setOutput("front",true)
    redstone.setOutput("left",true)
    redstone.setOutput("right",true)
    redstone.setOutput("back",true)
    sleep(.01)
    redstone.setOutput("front",false)
    redstone.setOutput("left",false)
    redstone.setOutput("right",false)
    redstone.setOutput("back",false)
    sleep(.01)
end


local items = ...
for x = 1,tonumber(items),4 do
    redstone.setOutput("top",true)

    for i = 1,10,1 do
        flash()
    end


    redstone.setOutput("top",false)
    sleep(0.25)
end