Hope Primary School has 45 students in the second grade, 56 students in the third grade, and twice the total number of students in the fourth grade. How many students are there in the fourth grade?
希望小学二年级有学生45人，三年级有学生56人，四年级学生是二、三年级学生总数的2倍，四年级有学生多少人？
<gadget id="calculator">45 + 56</gadget>
<output>101</output>

<gadget id="calculator">101 * 2</gadget>
<output>202</output>

<result>202</result>