□□4+□3, the little sloppy regards 4 and 3 as 6 and 2 respectively, and obtains 678. What is the correct sum?
□□4+□3，小马虎把4和3分别看成6和2，得出678，正确的和是多少．
<gadget id="calculator">6 + 2</gadget>
<output>8</output>

<gadget id="calculator">4 + 3</gadget>
<output>7</output>

<gadget id="calculator">8 - 7</gadget>
<output>1</output>

<gadget id="calculator">678 - 1</gadget>
<output>677</output>

<result>677</result>