Lu Xun went to bed at 23:00 and got up at 6:00 the next day. How many hours did he sleep in total?
鲁迅23：00睡觉，第二天6：00起床，他一共睡了多少小时．
<gadget id="calculator">1 + 6</gadget>
<output>7</output>

<result>7</result>