The school starts on February 22, 2013, and the summer vacation begins on July 12. How many days are there in this semester?
2013年2月22日开学，7月12日开始放暑假，这个学期一共多少天．
<gadget id="calculator">7 + 31 + 30 + 31 + 30 + 11</gadget>
<output>140</output>

<result>140</result>