Add 3 numbers after 235 to form a six-digit number so that it is a multiple of 3, 4, and 5 at the same time. What is the smallest six-digit number?
在235后面补上3个数字，组成一个六位数，使它同时是3、4、5的倍数，这个六位数最小是多少？
<result>235_020</result>