The 2010 Shanghai World Expo has become a great gathering of people from all over the world. The planned area of the World Expo Park is 5.28 square kilometers, of which Pudong is divided into 3.93 square kilometers and Puxi part is 1.35 square kilometers. The rest is within the fenced area (tickets are charged). How much land is used in the fenced area?
2010年上海世博会成为世界各国人民的一次伟大聚会．世博园的规划用地5.28平方公里，其中浦东部分为3.93平方公里，浦西部分1.35平方公里．其余为围栏区域(收取门票)范围，围栏区域用地多少？
<gadget id="calculator">5.28 - 3.93 - 1.35</gadget>
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