Xiaohua and Xiaohong live in the same community. Xiaohua's family lives in No. 2, 3rd Floor, Unit 2, Building 4, and the number is 4-2-302. Xiaohong's family lives in No. 1, Floor 4, Unit 1, Building 3. What's the number?
小华、小红住在同一个小区．小华家住在4号楼2单元3层2号，编号是4-2-302．小红家住在3号楼1单元4层1号，编号是多少．
<gadget id="calculator">3 - 1 - 401</gadget>
<output>-399</output>

<result>-399</result>