#include <bits/stdc++.h>
using namespace std;
using i64 = int64_t;
int main() {
  cin.tie(nullptr)->sync_with_stdio(false);
  cout << fixed << setprecision(20);
  int t = 1;
  for (int ti = 0; ti < t; ti += 1) {
    int n;
    cin >> n;
    auto s = to_string(n);
    set<string> ss;
    for (char c = '0'; c <= '9'; c += 1) {
      for (int i = 0; i <= ssize(s); i += 1) {
        if (not i and c == '0') { continue; }
        auto t = s;
        t.insert(t.begin() + i, c);
        ss.insert(t);
      }
    }
    cout << ss.size() << "\n";
  }
}