Students line up in a square formation to do exercises. In the square formation, Xiaohong stands at (1, 7), and there are 5 students behind her. How many people are there in this phalanx?
同学们排成方阵做操，在方阵中，小红站的位置是(1，7)，她后面还有5个同学．这个方阵一共有多少人．
<gadget id="calculator">7 + 5</gadget>
<output>12</output>

<gadget id="calculator">12 * 12</gadget>
<output>144</output>

<result>144</result>