Arrange a solid square array with Go pieces, add another 17 Go pieces to get a new solid square matrix, how many Go pieces are there in the original solid square matrix.
用围棋子排成一个实心方阵，再添17枚围棋子得到一个新的实心方阵，原先的实心方阵有多少枚围棋子．
<gadget id="calculator">17 - 1</gadget>
<output>16</output>

<gadget id="calculator">16 / 2</gadget>
<output>8</output>

<gadget id="calculator">8 * 8</gadget>
<output>64</output>

<result>64</result>