Xiaoming, mother, and father take a bus to go to Kunming, each ticket is 51 yuan, and they also take a bus when they come back. How much is the total cost?
小明、妈妈、爸爸乘客车去昆明游玩，每张车票51元，回来也乘客车，共需多少元？
<gadget id="calculator">3 * 51 * 2</gadget>
<output>306</output>

<result>306</result>