A3. If you write the numbers $1 \mathrm{t} / \mathrm{m} 12$ in sequence, you get the number 123456789101112, which consists of 15 digits. If you write the numbers $1 \mathrm{t} / \mathrm{m} n$ in sequence, then you get a number that consists of 1788 digits.

What is the value of $n$?
(A) 533
(B) 632
(C) 645
(D) 1599
(E) 1689