import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.math.BigDecimal;
import java.math.BigInteger;

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

            // 10^n－1－(2/3)×9^n
            // なんかPがでかいと誤差死するので3で割るのは最後にする
            BigInteger p10 = new BigInteger("10").pow(P).multiply(
                    new BigInteger("3"));
            BigInteger p9 = new BigInteger("9").pow(P);
            p9 = p9.multiply(new BigInteger("2"));
            BigInteger ans = p10.subtract(BigInteger.ONE).subtract(p9);
            System.out.println(ans.divide(new BigInteger("3")));
        } catch (Exception e) {
            System.err.println("Error:" + e.getMessage());
        }
    }
}