Hongxing Primary School donated to the disaster area. The second grade donated 318 yuan, and the third grade donated twice that of the second grade. How much is the total donation of the second and third grades?
红星小学为灾区捐款．二年级捐款318元，三年级的捐款是二年级的2倍，二、三年级一共捐款多少元？
<gadget id="calculator">318 * 2</gadget>
<output>636</output>

<gadget id="calculator">636 + 318</gadget>
<output>954</output>

<result>954</result>