Suppose x and y are two different numbers selected from the 500 natural numbers from 1 to 500, then what is the maximum value of (x+y)/(xy)
设x和y是选自1到500这500个自然数中的两个不同的数，那么(x+y)/(x-y)的最大值是多少
<gadget id="calculator">500 - 499</gadget>
<output>1</output>

<gadget id="calculator">499 / 1</gadget>
<output>499</output>

<gadget id="calculator">500 + 499</gadget>
<output>999</output>

<result>999</result>