The three members of Xiao Ming's family plan to visit a nearby scenic spot during the holiday. His father plans to spend as follows: 15 yuan for transportation, 75 yuan for accommodation, and 120 yuan for food. The round-trip train ticket is 270 yuan. If they go out for 15 days, at least how much money should they prepare?
小明一家三人准备在假期到附近的风景区游玩，他父亲计划每天的支出如下：交通费15元、住宿费75元、伙食费120元．往返火车票270元．他们如果外出15天，至少要准备多少钱？
<gadget id="calculator">210 + 270</gadget>
<output>480</output>

<result>480</result>