The young pioneers from the experimental school participated in the 2008 summer camp. They set off on July 25th and returned on August 3rd. How many days has this summer camp been held?
实验学校的少先队员参加了2008年夏令营活动，他们7月25日出发，8月3日回来．这次夏令营活动举办了多少天．
<gadget id="calculator">31 - 25</gadget>
<output>6</output>

<gadget id="calculator">3 - 1</gadget>
<output>2</output>

<gadget id="calculator">6 + 2</gadget>
<output>8</output>

<result>8</result>