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(); } } }