A row of people took pictures, and Xiaohong found that she was the third one from the left and the fifth one from the right. Then, how many people took pictures?
一排人照相，小红发现，自己处在从左边数的第三个，从右边数的第5个，那么，照相的人一共有多少个．
<gadget id="calculator">5 - 1</gadget>
<output>4</output>

<gadget id="calculator">3 + 4</gadget>
<output>7</output>

<result>7</result>