A cuboid pool is 2m long, 1m wide, and 5dm deep. Now it is necessary to attach cube tiles with a side length of 1dm around the pool and the bottom surface, so how many tiles of this kind of tiles are needed at least?
一个长方体水池，长2m，宽1m，深5dm．现在要在水池的四周和底面贴边长是1dm的正方体瓷砖，那么至少需要这种瓷砖多少块？
<gadget id="calculator">2 * 10 * 5</gadget>
<output>100</output>

<gadget id="calculator">1 * 10 * 5</gadget>
<output>50</output>

<gadget id="calculator">100 + 50</gadget>
<output>150</output>

<gadget id="calculator">150 * 2</gadget>
<output>300</output>

<gadget id="calculator">2 * 10 * 1 * 10</gadget>
<output>200</output>

<gadget id="calculator">300 + 200</gadget>
<output>500</output>

<gadget id="calculator">500 / 1</gadget>
<output>500</output>

<gadget id="calculator">500 * 1</gadget>
<output>500</output>

<result>500</result>