The number of people in each row and column is equal, Xiao Ming has 4 people in the east, west, north and south, how many people are there in this square team?
每行每列人数相等，小明的东西南北各有4人，这个正方形队伍一共有多少人？
<gadget id="calculator">4 + 1 + 4</gadget>
<output>9</output>

<gadget id="calculator">9 * 9</gadget>
<output>81</output>

<result>81</result>