When calculating □□3+□6, the little sloppy regards 3 and 6 as 5 and 2 respectively, and the result is 887. What is the correct sum?
计算□□3+□6时，小马虎把3和6分别看成5和2，结果得到887，正确的和是多少．
<gadget id="calculator">6 + 3</gadget>
<output>9</output>

<gadget id="calculator">5 + 2</gadget>
<output>7</output>

<gadget id="calculator">9 - 7</gadget>
<output>2</output>

<gadget id="calculator">887 + 2</gadget>
<output>889</output>

<result>889</result>