The 41st World Expo opened in Shanghai on May 1, 2010. The number of countries participating in this World Expo is 2 times less than that of the 2005 Aichi World Expo in Japan. There were 122 countries participating in the Aichi World Expo in Japan. The number of countries participating in the Shanghai World Expo How many?
2010年5月1日第41届世博会在上海开幕，参加本届世博会的国家数比2005年日本爱知世博会的2倍少2个，日本爱知世博会有122个国家参加，参加上海世博会的国家有多少个？
<gadget id="calculator">122 * 2</gadget>
<output>244</output>

<gadget id="calculator">244 - 2</gadget>
<output>242</output>

<result>242</result>