There are 780 students in a certain middle school. Among the students who go to the Mathematics Olympiad School, there happen to be (8/17) students who are in the first year of junior high school, and some (9/23) are students who are in the second year of junior high school. How many people did not enter the Olympiad School?
某中学初中共780人，该校去数学奥校学习的学生中，恰好有(8/17)是初一的学生，有(9/23)是初二的学生，那么该校初中学生中，没进奥校学习的有多少人？
<gadget id="calculator">17 * 23</gadget>
<output>391</output>

<gadget id="calculator">780 - 391</gadget>
<output>389</output>

<result>389</result>