n is a positive integer, D is a certain number, if ((n)/810)=0.9D5=0.9D59D59..., then n=how much.
n正整数，D某个数字，如果((n)/810)=0.9D5=0.9D59D59…，那么n=多少．
<gadget id="calculator">30 * 925</gadget>
<output>27_750</output>

<gadget id="calculator">27_750 / 37</gadget>
<output>750</output>

<result>750</result>