Li Tao laid out a square matrix of chess pieces on the Go board. There are two rows and two columns of white pieces. There are 72 white pieces in total, and the rest are black pieces. How many pieces are there in this square array?
李涛在围棋盘上摆出了一个正方形的棋子方阵，其中有两行、两列都是白子，这些白子共有72枚，而其余都是黑子，间这个方阵共有多少枚棋子？
<gadget id="calculator">72 + 4</gadget>
<output>76</output>

<gadget id="calculator">76 / 4</gadget>
<output>19</output>

<gadget id="calculator">19 * 19</gadget>
<output>361</output>

<result>361</result>