What is the sum of all the simplest fractions whose denominator is 1992?
分母为1992的所有最简分数之和是多少？
<gadget id="calculator">497 / 3</gadget>
<output>497/3 = around 165.666667</output>

<gadget id="calculator">499 / 3</gadget>
<output>499/3 = around 166.333333</output>

<gadget id="calculator">(499/3) - 4</gadget>
<output>487/3 = around 162.333333</output>

<gadget id="calculator">(497/3) + (487/3)</gadget>
<output>328</output>

<result>328</result>