import java.util.HashMap;
import java.util.Map;
import java.util.Scanner;

public class prog {

    public static void main(String[] args) throws java.lang.Exception {
        Scanner scanner = new Scanner(System.in);
        Map<String, Boolean> numbers = new HashMap<String, Boolean>();
        String n = scanner.nextLine();
        StringBuilder sb = new StringBuilder(n);
        for (int i = 2; i <= sb.length(); i++) {
            sb.insert(i, "x");
            for (int j = 0; j < 10; j++) {
                sb.setCharAt(i, (j+"").charAt(0));
                if(!numbers.containsKey(sb.toString())){
                    numbers.put(sb.toString(), true);
                }
            }
            sb.delete(i, i+1);
        }
        System.out.println(numbers.size());
        scanner.close();
    }
}