On one side of the road, a colorful flag is inserted every 2 meters (both ends are inserted), and a total of 50 flags are inserted. How long is this road in meters?
在公路的一侧，每隔2米插一面彩旗(两端都插)，共插了50面，这条公路长多少米．
<gadget id="calculator">50 - 1</gadget>
<output>49</output>

<gadget id="calculator">49 * 2</gadget>
<output>98</output>

<result>98</result>