How many semicircles with a diameter of 2 cm can be drawn in a rectangle with a length of 8 cm and a width of 5 cm.
在一个长8厘米，宽5厘米的长方形中画直径为2厘米的半圆，可以画多少个．
<gadget id="calculator">2 / 2</gadget>
<output>1</output>

<gadget id="calculator">5 / 1</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>