A student is reading a long textbook for a course. On the first day, they read $\frac{1}{6}$ of the pages plus 10 more. On the second day, they read $\frac{1}{5}$ of the remaining pages plus 20 pages. On the third day, they read $\frac{1}{4}$ of the remaining pages plus 30 pages. On the fourth day, they read $\frac{1}{3}$ of the remaining pages plus 40 pages. After this, there were exactly 46 pages left to read, which they finished on the fifth day. How many pages are in this textbook?