There is a residential building in Wenyuan Community, each household has subscribed to 2 different newspapers, a total of 3 newspapers. Among them, "** Metropolis Daily" ordered 34 copies, "** Evening News" ordered 30 copies, and "** Weekly" ordered 22 copies. Question: How many households have subscribed to "** Metropolis Daily" and "** Weekly" at the same time?
文苑小区有一栋居民楼，每户人家都订了2份不同的报纸，一共订了3种报纸．其中《**都市报》订了34份，《**晚报》订了30份，《**周报》订了22份．问：有多少户人家同时订了《**都市报》和《**周报》？
<gadget id="calculator">34 + 30 + 22</gadget>
<output>86</output>

<gadget id="calculator">86 / 2</gadget>
<output>43</output>

<gadget id="calculator">43 - 30</gadget>
<output>13</output>

<result>13</result>