import java.io.*; import java.util.*; import java.util.stream.*; public class Main { public static void main(String[] args) throws Exception { Scanner sc = new Scanner(); int p = sc.nextInt(); long[][] dp = new long[p + 1][3]; dp[0][0] = 1; for (int i = 1; i <= p; i++) { for (int j = 0; j < 3; j++) { for (int k = 0; k < 10; k++) { if (k == 3) { continue; } dp[i][(j + k) % 3] += dp[i - 1][j]; } } } long total = 0; for (long x : dp[p]) { total += x; } long ans = pow(10, p) - total + dp[p][0] - 1; System.out.println(ans); } static long pow(long x, int p) { if (p == 0) { return 1; } else { return pow(x, p - 1) * x; } } } class Utilities { static String arrayToLineString(Object[] arr) { return Arrays.stream(arr).map(x -> x.toString()).collect(Collectors.joining("\n")); } static String arrayToLineString(int[] arr) { return String.join("\n", Arrays.stream(arr).mapToObj(String::valueOf).toArray(String[]::new)); } } class Scanner { BufferedReader br = new BufferedReader(new InputStreamReader(System.in)); StringTokenizer st = new StringTokenizer(""); StringBuilder sb = new StringBuilder(); public Scanner() throws Exception { } public int nextInt() throws Exception { return Integer.parseInt(next()); } public long nextLong() throws Exception { return Long.parseLong(next()); } public double nextDouble() throws Exception { return Double.parseDouble(next()); } public int[] nextIntArray() throws Exception { return Stream.of(br.readLine().split(" ")).mapToInt(Integer::parseInt).toArray(); } public String next() throws Exception { while (!st.hasMoreTokens()) { st = new StringTokenizer(br.readLine()); } return st.nextToken(); } }