How many circles with a radius of 2 cm can be cut from a rectangular piece of paper with a length of 30 cm and a width of 20 cm.
在长30厘米，宽20厘米的长方形纸片上最多能剪多少个半径为2厘米的圆．
<gadget id="calculator">5 + 4 + 5 + 5 + 5 + 5 + 4 + 5</gadget>
<output>38</output>

<result>38</result>