#include <iostream>
#include <vector>
#include <algorithm>

using namespace std;

int main()
{
    string s;
    cin >> s;
    long long muvdb = 0;
    for (int i = 0; i < s.length(); i++)
    {
        muvdb += s[i] - '0';
    }
    long long ossz = 0;
    for (int i = 1; i <= s.length() - 1; i++) {
        ossz += i;
    }
    cout << muvdb + 9 * ossz;
}