Xiaolin's mother went to Beijing on a business trip on May 14 and came back on July 30. How many days did she travel in total?
小林的妈妈5月14日出差去北京，7月30日回来，她一共出差多少天．
<gadget id="calculator">31 - 14</gadget>
<output>17</output>

<gadget id="calculator">17 + 1</gadget>
<output>18</output>

<gadget id="calculator">18 + 30 + 30</gadget>
<output>78</output>

<result>78</result>