Students line up in a square formation to do exercises. It is known that there are 6 people in Xiaodong's front, back, left, and right sides. How many people are there in this square formation?
同学们排成一个方阵做操，已知小东的前、后、左、右各有6人，这个方阵共有多少人．
<gadget id="calculator">6 + 6 + 1</gadget>
<output>13</output>

<gadget id="calculator">13 * 13</gadget>
<output>169</output>

<result>169</result>