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

#define endl '\n'
#define int long long
#define ull unsigned long long
typedef long long ll;
#define lowbit(x) ((x) & -(x))

const ll INF = 0x3f3f3f3f;
const ll mod = 998244353;
const int N = 2e5 + 5, M = 5e5 + 10;
typedef pair<int, int> PII;
double T = 1 >> 30;
// double PI = acos(-1);

int gcd(int a, int b)
{
    return b ? gcd(b, a % b) : a;
}

int lcm(int a, int b)
{
    return a / gcd(a, b) * b;
}

void solve()
{
    int i, j;

    int n;
    cin >> n;

    if(n<10)
    {
        cout << n + 1;
        return;
    }

    int len = log10(n);
    int t = 1;
    for (i = 1; i <= len;i++)
    {
        t = t * 10 + 1;
    }

    int ans = n / t + 10 * len;
    cout << ans;
}

signed main()
{
    // ios_base::sync_with_stdio(false);
    // cin.tie(nullptr);
    // cout.tie(nullptr);
    int t = 1;

    // cin >> t;

    while (t--)
    {
        solve();
    }

 
    return 0;
}