A three-digit number, each digit is A, B, C, they are not equal to each other, and none of them are 0. Use A, B, C to arrange six different three-digit numbers. If the sum of these six three-digit numbers is 2442, what is the largest of these six three-digit numbers?
一个三位数，各位数字分别为A、B、C，它们互不相等，且都不为0．用A、B、C排得六个不同的三位数，若这六个三位数之和是2442，则这六个三位数中最大的是多少．
<result>821</result>