On May 1, 2010, the Shanghai World Expo was grandly opened, and until it closed on the evening of October 31, how many days has the World Expo been open?
2010年5月1日，上海世博会隆重开幕了，到10月31日晚闭幕，世博会一共开放了多少天．
<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>