Fengxue Elementary School organized students to participate in tree planting activities. The fourth grade planted 356 trees, 98 more than the third grade, and the fifth grade planted twice as many trees as the third grade. How many trees are planted in fifth grade?
风雪小学组织学生参加植树活动，四年级植树356棵，比三年级多98棵，五年级植树棵数是三年级的2倍．五年级植树多少棵？
<gadget id="calculator">356 - 98</gadget>
<output>258</output>

<gadget id="calculator">258 * 2</gadget>
<output>516</output>

<result>516</result>