A Yangtze River Bridge is 4,500 meters long, and a billboard is installed every 45 meters on both sides of the bridge. Do you know how many billboards are installed on this bridge? (Both ends are also installed)
一座长江大桥长4500米，在桥的两旁每隔45米安装一块广告牌．你知道这座大桥上一共安装了多少块广告牌吗？(两端也要安装)
<gadget id="calculator">4_500 / 45</gadget>
<output>100</output>

<gadget id="calculator">100 + 1</gadget>
<output>101</output>

<gadget id="calculator">101 * 2</gadget>
<output>202</output>

<result>202</result>