题目描述

The task is simple: given any positive integer N, you are supposed to count the total number of 1's in the decimal form of the integers from 1 to N.  For example, given N being 12, there are five 1's in 1, 10, 11, and 12.

输入描述:

Each input file contains one test case which gives the positive N (<=230).

输出描述:

For each test case, print the number of 1's in one line.

输入例子:

12

输出例子:

5