The letters a and b represent two different natural numbers respectively. If the following equation holds true, (2015+a)-(2015-b)=10, then what is the maximum product of a and b?
字母a、b分别表示两个不同的自然数，如果下面的等式成立，(2015+a)-(2015-b)=10那么a与b的积最大是多少．
<gadget id="calculator">4 * 6</gadget>
<output>24</output>

<result>24</result>