import java.io.BufferedReader;
import java.io.InputStreamReader;

public class No220_2 {
    public static void main(String[] args) {
        try {
            BufferedReader br = new BufferedReader(new InputStreamReader(
                    System.in));
            int N = Integer.parseInt(br.readLine());

            // 10^n－1－(2/3)×9^n
            long ans = (long) (Math.pow(10, N) - 1 - (2 / 3.0) * Math.pow(9, N));
            System.out.println(ans);
        } catch (Exception e) {
            System.err.println("Error:" + e.getMessage());
        }
    }
}