import java.util.Scanner;
import java.util.*;

public class prog {
  Scanner sc = new java.util.Scanner(System.in);

  private void solve() {
    String no = sc.next();
    Set<String> numbers = new HashSet<String>();
    for (int i = 2; i < 10; i++) {
      for (int dig = 0; dig <= 9; dig++) {
        numbers.add(no.substring(0, i) + dig + no.substring(i));
      }
    }
    System.out.println(numbers.size());
  }

  public static void main(final String[] args) {
    new prog().solve();
  }
}