Xiao Ming is in a square array, no matter which side of the array he looks at, his position can be represented by the number pair (5, 5), how many people are there in this array.
小明在一个正方形方阵中，无论从方阵的哪一边看，他的位置都能用数对(5，5)表示，这个方阵共有多少人．
<gadget id="calculator">5 - 1</gadget>
<output>4</output>

<gadget id="calculator">5 + 4</gadget>
<output>9</output>

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

<result>81</result>