The 2014 Brazil World Cup starts on June 12 and ends on July 13. How many days are there from start to finish?
2014巴西世界杯6月12日开始，7月13日结束，从开始到结束一共多少天．
<gadget id="calculator">30 - 12</gadget>
<output>18</output>

<gadget id="calculator">18 + 1 + 13</gadget>
<output>32</output>

<result>32</result>