A total of 72 pieces can be placed on the outermost layer of the Go board (one in each of the four corners), how many pieces can be placed on each side.
围棋盘的最外层一共可摆放72枚棋子(四角各摆一个)，每边能放多少个棋子．
<gadget id="calculator">72 + 4</gadget>
<output>76</output>

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

<result>19</result>