Numbering of pages in the book required 2323 figures. The first two pages, the last and also the beginning of each chapter are not numbered from them. In total in the book five chapters. The first begins on the 3rd page, and the second – on the 99th. How many pages in the book?

319
Numbering of pages with 1 on 9 requires 9 figures. But 1, 2 and 3 page are not numbered. Means here used 6 figures. Numbering of pages with 10 on 98 requires 178 figures (on two on each page). In total for numbering of pages with 1 on 99 used 6+178 = 184 figures. 2323-184 = 2139 figures remained. Further there are three-digit page numbers. 2139:3 = 713 pages can be numbered in the remained figures. Total 812 pages turned out 99+713 =. But on pages with Chapters 3, 4 and 5 of numbers is not present. Means, in the book 812+3 = 815 pages .
372
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