The students line up to dance, and there are the same number of people in each row and column. Xiaohong's position is the 4th, whether counting from the front to the back, counting from the left or counting from the right. How many people are dancing?
同学们的排队跳舞，每行、每列人数同样多，小红的位置无论从前数从后数，从左数还是从右数都是第4个，跳舞的共有多少人．
<gadget id="calculator">3 + 3 + 1</gadget>
<output>7</output>

<gadget id="calculator">7 * 7</gadget>
<output>49</output>

<result>49</result>