There are 480 students in a certain elementary school. Among the students in the school who participated in the mathematics competition, the fifth grade students accounted for (6/13), and the fourth grade students accounted for (7/19), so how many students in this school did not participate in the mathematics competition.
某小学共有480名学生，该校参加数学竞赛的学生中，五年级的占(6/13)，四年级的占(7/19)，那么该校学生中没有参加数学竞赛的有多少人．
<gadget id="calculator">480 - 247</gadget>
<output>233</output>

<result>233</result>