import java.util.Scanner;


public class Main_yukicoder220 {

	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);

		int p = sc.nextInt();

		long[] dp = new long[p + 1];
		long[][] dp2 = new long[3][p + 1];

		long base = 1;
		for (int i = 1; i <= p; i++) {
			for (int j = 0; j < 10; j++) {
				if (j == 3) {
					dp[i] += base;
				} else {
					dp[i] += dp[i - 1];

					if (base == 1) {
						dp2[j % 3][i]++;
					} else {
						for (int k = 0; k < 3; k++) {
							dp2[(int)((base * j + k) % 3)][i] += dp2[k][i - 1];
						}
					}
				}
			}
			
			base *= 10;
		}
		
		System.out.println(dp[p] + dp2[0][p] - 1);
		
		sc.close();
	}
}