There are 26 non-sixth-grade students in the school mathematics interest group, and 25 non-fifth-grade students. Now we know that there are 35 people in the fifth and sixth grades participating in the mathematics interest group. How many people are there in this group?
学校数学兴趣小组有26人不是六年级学生，25人不是五年级学生，现在知道五、六年级共有35人参加数学兴趣小组，这个小组共有多少人？
<gadget id="calculator">35 + 26 + 25</gadget>
<output>86</output>

<gadget id="calculator">86 / 2</gadget>
<output>43</output>

<result>43</result>