To make a plastic box without a cover, the length is 0.6m, the width is 0.4m, and the height is 0.5m. It is estimated that 0.4m**2 plastic boards will be lost during the production process. How many plastic sheets are needed to make this plastic box?
要制作一个无盖的塑料盒，长0.6m，宽0.4m，高0.5m，预计在制作过程中要损耗0.4m**2的塑料板．制作这个塑料盒需要准备多少塑料板？
<gadget id="calculator">0.6 * 0.4</gadget>
<output>0.24</output>

<gadget id="calculator">0.6 * 0.5</gadget>
<output>0.3</output>

<gadget id="calculator">0.4 * 0.5</gadget>
<output>0.2</output>

<gadget id="calculator">0.3 + 0.2</gadget>
<output>0.5</output>

<gadget id="calculator">0.5 * 2</gadget>
<output>1</output>

<gadget id="calculator">0.24 + 1 + 0.4</gadget>
<output>1.64</output>

<result>1.64</result>