package no220;

import java.util.Scanner;

public class Main {

	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		int p = sc.nextInt();
		long[][] dp = new long[p+1][4];
		dp[0][1] = 1;
		for(int i=0;i<p;i++) {
			for(int j=0;j<3;j++) {
				for(int k=0;k<=9;k++) {
					if (k == 3) {
						dp[i+1][3] += dp[i][j];
					}else{
						dp[i+1][(j+k)%3] += dp[i][j];
					}
				}
			}
			dp[i+1][3] += dp[i][3] * 10;
		}
//		System.out.println(Arrays.deepToString(dp));
		System.out.println(dp[p][0] + dp[p][3] - 1);
	}

}