7. Lei Lei bought a new book and liked it very much. On the first day, he read $\frac{1}{5}$ of the book plus 12 pages, on the second day, he read $\frac{1}{4}$ of the remaining plus 15 pages, and on the third day, he read $\frac{1}{3}$ of the remaining plus 18 pages. At this point, there were still 42 pages left to read. So, the total number of pages in the book is . $\qquad$
$190$