import java.io.IOException;
import java.util.InputMismatchException;

public class Main {
	void run() {
		MyScanner sc = new MyScanner();

		int n = sc.nextInt();

		/*
		int s = 1;
		for (int i = 0; i < n; i++) {
			s *= 10;
		}
		int count = 0;
		for (int i = 1; i < s; i++) {
			if (i % 3 == 0) {
				count++;
				continue;
			}
			int k = i;
			boolean f = false;
			while (!f && 0 < k) {
				if (k % 10 == 3) {
					f = true;
				}
				k /= 10;
			}
			if (f) {
				count++;
			}
		}
		System.out.println(count);

		if (n == 19) {
			System.out.println(9099432188218005273L);
			return;
		}
		 */

		long[] u = new long[20];
		long[] t = new long[20];
		long tmp1 = 9;
		long tmp2 = 8;
		for (int i = 1; i < n + 1; i++) {
			u[i] = tmp1;
			tmp1 *= 10;
			t[i] = tmp2;
			tmp2 *= 9;
		}
		for (int i = 1; i < n + 1; i++) {
			t[i] = t[i] * 2 / 3;
		}
		for (int i = 1; i < n + 1; i++) {
			u[i] += u[i - 1];
			t[i] += t[i - 1];
		}
		System.out.println(u[n] - t[n] - 1);
	}

	public static void main(String[] args) {
		new Main().run();
	}

	public void mapDebug(int[][] a) {
		System.out.println("--------map display---------");
		for (int i = 0; i < a.length; i++) {
			for (int j = 0; j < a[i].length; j++) {
				System.out.printf("%3d ", a[i][j]);
			}
			System.out.println();
		}
		System.out.println("----------------------------" + '\n');
	}

	class MyScanner {
		int read() {
			try {
				return System.in.read();
			} catch (IOException e) {
				throw new InputMismatchException();
			}
		}

		boolean isSpaceChar(int c) {
			return c == ' ' || c == '\n' || c == '\r' || c == '\t' || c == -1;
		}

		boolean isEndline(int c) {
			return c == '\n' || c == '\r' || c == -1;
		}

		int nextInt() {
			return Integer.parseInt(next());
		}

		int[] nextIntArray(int n) {
			int[] array = new int[n];
			for (int i = 0; i < n; i++)
				array[i] = nextInt();
			return array;
		}

		long nextLong() {
			return Long.parseLong(next());
		}

		long[] nextLongArray(int n) {
			long[] array = new long[n];
			for (int i = 0; i < n; i++)
				array[i] = nextLong();
			return array;
		}

		double nextDouble() {
			return Double.parseDouble(next());
		}

		double[] nextDoubleArray(int n) {
			double[] array = new double[n];
			for (int i = 0; i < n; i++)
				array[i] = nextDouble();
			return array;
		}

		String next() {
			int c = read();
			while (isSpaceChar(c))
				c = read();
			StringBuilder res = new StringBuilder();
			do {
				res.appendCodePoint(c);
				c = read();
			} while (!isSpaceChar(c));
			return res.toString();
		}

		String[] nextStringArray(int n) {
			String[] array = new String[n];
			for (int i = 0; i < n; i++)
				array[i] = next();

			return array;
		}

		String nextLine() {
			int c = read();
			while (isEndline(c))
				c = read();
			StringBuilder res = new StringBuilder();
			do {
				res.appendCodePoint(c);
				c = read();
			} while (!isEndline(c));
			return res.toString();
		}
	}
}