The students lined up in a square formation to do exercises, and there were 3 people in Xiaoxin's front, back, left and right. How many people are there?
同学们排成方阵做操，小欣的前、后、左、右都有3人．一共有多少人？
<gadget id="calculator">3 + 3 + 1</gadget>
<output>7</output>

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

<result>49</result>