7.A, B, C represent digits from 1 to 9, $\overline{A B C}+\overline{B C A}+\overline{C A B}+\overline{A B}+\overline{B C}+\overline{C A}+A+B+C=861$. What is the sum of all three-digit numbers $\overline{A B C}$ that satisfy this condition? $\qquad$
【Answer】 3885