How many circles with a radius of 2.5 cm can be cut from a rectangular piece of paper with a length of 40 cm and a width of 15 cm.
从一张长40厘米、宽15厘米的长方形纸中，最多能剪多少个半径为2.5厘米的圆．
<gadget id="calculator">2.5 * 2</gadget>
<output>5</output>

<gadget id="calculator">40 / 5</gadget>
<output>8</output>

<gadget id="calculator">15 / 5</gadget>
<output>3</output>

<gadget id="calculator">8 * 3</gadget>
<output>24</output>

<result>24</result>