Among the youth band students, 170 are not fifth graders, and 135 are not sixth graders. It is known that there are 205 students in the fifth and sixth grades. How many students are there in the Youth Orchestra other than the fifth and sixth grades?
少年乐团学生中有170人不是五年级学生，有135人不是六年级学生．已知五、六年级学生共有205人，求少年乐团中五、六年级以外的学生共有多少人？
<gadget id="calculator">170 - 205</gadget>
<output>-35</output>

<gadget id="calculator">135 + (-35)</gadget>
<output>100</output>

<gadget id="calculator">100 / 2</gadget>
<output>50</output>

<result>50</result>