Cut out a circular piece of paper with a radius of 1dm from a rectangular cardboard with a length of 10dm and a width of 8dm. How many pieces can be cut at most?
在一个长10dm，宽8dm的长方形硬纸板里剪出半径是1dm的圆形纸片，最多可剪多少个．
<gadget id="calculator">10 / 2</gadget>
<output>5</output>

<gadget id="calculator">8 / 2</gadget>
<output>4</output>

<gadget id="calculator">5 * 4</gadget>
<output>20</output>

<result>20</result>