To celebrate the National Day, the school organizes a chorus performance for teachers and students. Each class selects 35 students. There are 45 classes in the school, and 65 teachers will participate. How many people are there in this chorus performance?
庆祝国庆节，学校组织师生大合唱表演，每个班选35名学生，学校共45个班，还要有65名老师参加，这次合唱表演共有多少人？
<gadget id="calculator">1_575 + 65</gadget>
<output>1_640</output>

<result>1_640</result>