The school held a summer camp activity, with 35 participants in the third grade, 18 more participants in the fourth grade than the third grade, and twice as many participants in the fifth grade as the total number of participants in the third and fourth grades. How many fifth graders attend summer camp?
学校举行夏令营活动，三年级有35人参加，四年级参加的人数比三年级多18人，五年级参加的人数是三、四年级参加总人数的2倍．五年级有多少人参加夏令营？
<gadget id="calculator">35 + 35 + 18</gadget>
<output>88</output>

<gadget id="calculator">88 * 2</gadget>
<output>176</output>

<result>176</result>