If ((○)/11)＜(7/(□))＜(4/5), what is the maximum sum of non-zero natural numbers that can be filled in "○" and "□".
如果((○)/11)＜(7/(□))＜(4/5)，则"○"与"□"中可以填入的非零自然数之和最大为多少．
<gadget id="calculator">7 + 10</gadget>
<output>17</output>

<result>17</result>