On a railway transfer line, there are five warehouses in Zhangjia Village, Yepo Village, Wangzhai Village, Lidian Village, and Huangzhuang Village every 100 kilometers. There are 10 tons of cotton in the warehouse of Zhangjia Village, 20 tons of steel in the warehouse of Lidian Village, 40 tons of grain in the warehouse of Wangzhai Village, and two warehouses in Yepo Village and Huangzhuang Village are empty. Now I want to store all the goods in several warehouses in one warehouse. If it costs 1 yuan to transport 1 kilometer per ton of goods, how much is the minimum shipping cost?
在一条铁路转运线上，每隔100千米依次有张家村，叶坡村、王寨村、李店村、黄庄村五个仓库．张家村仓库存有10吨棉花，李店村仓库存有20吨钢材，王寨村仓库存有40吨粮食，叶坡村和黄庄村两个仓库空仓．现在想把几个仓库中的所有货物集中存放在一个仓库里，如果每吨货物运输1千米需要1元钱，那么最少需要运费多少元？
<gadget id="calculator">2 * 100 * 10 * 1</gadget>
<output>2_000</output>

<gadget id="calculator">1 * 100 * 20 * 1</gadget>
<output>2_000</output>

<gadget id="calculator">2_000 + 2_000</gadget>
<output>4_000</output>

<result>4_000</result>