A rectangular piece of paper is 4 decimeters long and 1 decimeter wide, how many circular pieces of paper with a radius of 5 centimeters can be cut at most.
一块长方形纸片长4分米，宽1分米，最多能剪出多少个半径是5厘米的圆形纸片．
<gadget id="calculator">1 * 10</gadget>
<output>10</output>

<gadget id="calculator">10 / 10</gadget>
<output>1</output>

<gadget id="calculator">4 * 1 * 1</gadget>
<output>4</output>

<result>4</result>