The school holds a sports meeting. There are 45 participants in the third grade, 8 more participants in the fourth grade than in 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 participants in the fifth grade?
学校举行运动会．三年级有45人参加，四年级参赛的人数比三年级多8人，五年级的参赛人数是三四年级参赛总人数的2倍，五年级有多少人参赛？
<gadget id="calculator">45 + 8 + 45</gadget>
<output>98</output>

<gadget id="calculator">98 * 2</gadget>
<output>196</output>

<result>196</result>