macro(1000, "exchange money", function()
  local containers = getContainers()
  for i, container in pairs(containers) do
    for j, item in ipairs(container:getItems()) do
      if item:isStackable() and (item:getId() == 3035 or item:getId() == 3031) and item:getCount() == 100 then
        g_game.use(item)
        return
      end
    end
  end
end)