There are 5 lighted candles in the room. A gust of wind blows in through the door and blows out 2 candles, and then blows out 1 candle. At this time, the owner closes the door. The next day, when the owner gets up, how many candles are there in the room?
房间内有5枝点燃的蜡烛，一阵风从门刮进来吹灭了2枝，后来又吹熄了1枝，这时候主人把门关了，第二天，主人起来，房间内还有多少枝蜡烛．
<gadget id="calculator">2 + 1</gadget>
<output>3</output>

<result>3</result>