The school holds a sports meeting. There are 35 people in the third grade participating in the competition, the number of participating in the fourth grade is twice that of the third grade, and the number of participating in the fifth grade is 50 less than twice the number of participating in the fourth grade. How many people in the fifth grade participate in the competition?
学校举行运动会．三年级有35人参加比赛，四年级参加的人数是三年级的2倍，五年级参加的人数比四年级参加人数的2倍少50人，五年级参加比赛的有多少人？
<gadget id="calculator">35 * 2 * 2</gadget>
<output>140</output>

<gadget id="calculator">140 - 50</gadget>
<output>90</output>

<result>90</result>