NumberOfEntireDigits

#include <iostream>
using namespace std;
int sumOfDigits(int n) {
    int result = 0;
    while (n > 0) {
        result += 1;
        n = n / 10;
    }
    return result;
}
int main()
{
    int n = 0;
    int result = 0;
    cin >> n;
    for (int i = 1; i <= n; i++) {
        result += sumOfDigits(i);
    }
    cout << result;
}