OC robot stygian anvil multiple products

local component = require("component")
local sides = require("sides")
local os = require("os")
local robot = require("robot")
local inv = component.inventory_controller
local red = component.redstone
local pulsetime = 0.1

local function drop(slot)
    robot.select(slot)
            robot.dropDown()

end


while true do
while red.getInput(sides.top) > 1 do
        robot.select(1)

        robot.use(sides.front,false)



    robot.dropDown()
 if robot.count(2)>0 or robot.count(3)>0 or robot.count(4) > 0 then
        os.sleep(0.1)
        for i = 1, 16 do  --dropping all items
            drop(i)
        end



        os.sleep(0.1)


    end

end


os.sleep(1)


end