#include <iostream>
#include <string>
#include <set>
using namespace std;

int main()
{
    string N;
    cin >> N;
    set<string> ans;
    for (int i = 0; i <= N.length(); i++)
    {
        for (int n = 0; n < 10; n++)
        {
            string s = "";
            int now = 0;
            for (int j = 0; j <= N.length(); j++)
            {
                if (i == j)
                {
                    s += to_string(n);
                }
                else
                {
                    s += N[now];
                    now++;
                }
            }
            if (s[0] != '0')
            {
                ans.insert(s);
            }
        }
    }
    cout << ans.size() << endl;
}