There are four classes in grade six in a certain school, among which there are 81 students in Class One and Class Two, 83 students in Class Two and Class Three, 86 students in Class Three and Class Four, and Class One has 2 more students than Class Four. How many more people are there in class one than class two?
某校六年级有四个班，其中一班和二班共有81人，二班和三班共有83人，三班和四班共有86人，一班比四班多2人．一班比二班多多少人．
<gadget id="calculator">2 - 81</gadget>
<output>-79</output>

<gadget id="calculator">86 + (-79)</gadget>
<output>7</output>

<gadget id="calculator">83 - 7</gadget>
<output>76</output>

<gadget id="calculator">76 / 2</gadget>
<output>38</output>

<gadget id="calculator">81 - 38</gadget>
<output>43</output>

<gadget id="calculator">43 - 38</gadget>
<output>5</output>

<result>5</result>