A new swimming pool is built in the fitness center. The swimming pool is 50m long, 20m wide and 2.5m deep. Now tiles are to be pasted around and on the bottom of the pool, and how many tiles are needed in total with a size of 50cm*50cm (meaning that the length and width are both 50cm).
健身中心新建一个游泳池，该游泳池长50m，宽20m，深2.5m．现在要在池的四周和底面都贴上瓷砖，用50cm*50cm(表示长和宽都是50cm)这种规格的瓷砖，一共需要多少块．
<gadget id="calculator">50 * 20</gadget>
<output>1_000</output>

<gadget id="calculator">50 * 2.5 * 2</gadget>
<output>250</output>

<gadget id="calculator">20 * 2.5 * 2</gadget>
<output>100</output>

<gadget id="calculator">1_000 + 250 + 100</gadget>
<output>1_350</output>

<gadget id="calculator">50 / 100</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">(1/2) * (1/2)</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">1_350 / (1/4)</gadget>
<output>5_400</output>

<result>5_400</result>