A certain city plans to hold a film festival from July 28 to August 3. How many days has the film festival been held in total?
某市打算在7月28日到8月3日举办电影节，电影节一共举办了多少天．
<gadget id="calculator">31 - 28</gadget>
<output>3</output>

<gadget id="calculator">3 + 1 + 3</gadget>
<output>7</output>

<result>7</result>