In a certain city, 350 people were commended, among them 86 were excellent students, 209 were excellent young pioneers, and the rest were excellent class cadres. May I ask how many excellent class cadres are there?
某市有350人得到表彰，其中获得优秀三好学生的有86人，获得优秀少先队员的有209人，剩下的都是优秀班干部．请问优秀班干部的有多少人？
<gadget id="calculator">350 - 86 - 209</gadget>
<output>55</output>

<result>55</result>