The sum of 6 non-repeating three-digit numbers that can be formed by three different non-zero numbers is 3774. What is the maximum number of the largest three-digit number among them?
三个非零的不同数字，可以组成6个不重复的三位数之和是3774，则其中最大的三位数最大可以是多少．
<result>971</result>