There is a 400-meter-long street from the square to the shopping mall, and a pine tree is placed every 2 meters on both sides of the street. If no trees are planted at both ends of the road, how many pine trees are planted on both sides of the street? ?
从广场到商场是一条长400米的街道，在街道的两旁每隔2米载上一棵松树，如果在路的两端都不栽树，那么这条街的两侧一共栽了多少棵松树？
<gadget id="calculator">400 / 2</gadget>
<output>200</output>

<gadget id="calculator">200 - 1</gadget>
<output>199</output>

<gadget id="calculator">199 * 2</gadget>
<output>398</output>

<result>398</result>