The Shanghai World Expo will start on May 1 this year and end on October 31. How many days will the exhibition last?
上海世博会于今年5月1日开始，10月31日结束，展期多少天．
<gadget id="calculator">31 * 4</gadget>
<output>124</output>

<gadget id="calculator">30 * 2</gadget>
<output>60</output>

<gadget id="calculator">124 + 60</gadget>
<output>184</output>

<result>184</result>