Problem:
Score : 200 points

Problem Statement

Given is an integer N. Find the number of positive integers less than or equal to N that have an odd number of digits (in base ten without leading zeros).

Constraints

1 \leq N \leq 10^5

Input

Input is given from Standard Input in the following format:

N

Output

Print the number of positive integers less than or equal to N that have an odd number of digits.

Sample Input 1

11

Sample Output 1

9

Among the positive integers less than or equal to 11, nine integers have an odd number of digits: 1, 2, \ldots, 9.

Sample Input 2

136

Sample Output 2

46

In addition to 1, 2, \ldots, 9, another 37 integers also have an odd number of digits: 100, 101, \ldots, 136.

Sample Input 3

100000

Sample Output 3

90909

Solution in C++14 (GCC 5.4.1) (judge verdict: Accepted)

#include <bits/stdc++.h>
using namespace std;

int main() {

  int N;
  cin >> N;
  if (N >= 1 && N < 10) {
    cout << N << endl;
  }
  else if (N >= 10 && N < 100) {
    cout << 9 << endl;
  }
  else if (N >= 100 && N < 1000) {
    cout << N - 90 << endl;
  }
  else if (N >= 1000 && N < 10000) {
    cout << 909 << endl;
  }
  else if (N >= 10000 && N < 100000) {
    cout << N - 9090 << endl;
  }
  else {
    cout << 90909 << endl;
  }
}