The third grade students do good deeds. The first shift does 43 pieces, the second shift does 34 pieces, and the third shift does 28 fewer pieces than the first and second shifts. How many good deeds does Class Three do?
三年级同学做好事．一班做43件，二班做34件，三班比一、二班做的总数少28件．三班做多少件好事？
<gadget id="calculator">34 - 28</gadget>
<output>6</output>

<gadget id="calculator">43 + 6</gadget>
<output>49</output>

<result>49</result>