Put flowers on both sides of a 50-meter-long straight road, put a pot every 2 meters, and put no flowers at both ends of each side of the straight road, how many pots of flowers do you need to put in total?
在一条长50米的直道两边放花，每隔2米放一盆，直道每边的两端都不放花，一共需要放多少盆花．
<gadget id="calculator">50 / 2</gadget>
<output>25</output>

<gadget id="calculator">25 - 1</gadget>
<output>24</output>

<gadget id="calculator">24 * 2</gadget>
<output>48</output>

<result>48</result>