On a square iron sheet with a side length of 4 cm, cut out small circles with a diameter of 2 cm. How many pieces can be cut at most?
在一块边长为4厘米的正方形的铁皮上，剪出直径为2厘米的小圆片，最多可剪多少片．
<gadget id="calculator">4 / 2</gadget>
<output>2</output>

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

<result>4</result>