The school held a drawing competition. There are 40 participants in the third grade, 17 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 fifth graders are participating?
学校举行绘画大赛．三年级有40人参赛，四年级参赛的人数比三年级多17人，五年级参赛的人数是三、四年级参赛总人数的2倍．五年级有多少人参赛？
<gadget id="calculator">40 + 17</gadget>
<output>57</output>

<gadget id="calculator">57 + 40</gadget>
<output>97</output>

<gadget id="calculator">97 * 2</gadget>
<output>194</output>

<result>194</result>