import java.util.HashSet;
import java.util.Scanner;
import java.util.Set;

public class Main {
	public static void main(String[] args) throws Exception {
		Scanner sc = new Scanner(System.in);
		String s = sc.next();
		sc.close();

		Set<Long> set = new HashSet<>();
		for (int i = 0; i <= s.length(); i++) {
			for (int j = 0; j <= 9; j++) {
				String t = s.substring(0, i) + j + s.substring(i);
				long v = Long.parseLong(t);
				set.add(v);
			}
		}
		set.remove(Long.parseLong(s));
		System.out.println(set.size());
	}
}