import java.util.*;
public class Main {
	static long cul(long p){
		if(p==1){
			return 3;
		}
		return cul(p-1)*3+(cul(p-1)+1)*3+(cul(p-1)+2)*3+((long)Math.pow(10, p-1)-1);
	}
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		long P = sc.nextLong();
		System.out.println(cul(P));
	}
}