import std.algorithm;
import std.array;
import std.ascii;
import std.container;
import std.conv;
import std.math;
import std.numeric;
import std.range;
import std.stdio;
import std.string;
import std.typecons;
void log(A...)(A arg) { stderr.writeln(arg); }
int size(T)(in T s) { return cast(int)s.length; }

void main() {
    auto P = readln.chomp.to!int;
    auto f = new long[][](P + 1, 3);
    f[1][0] = 4;
    f[1][1] = 4;
    f[1][2] = 4;
    for (int i = 1; i < P; i++) {
        for (int j = 0; j < 3; j++) {
            f[i + 1][j] = 10L ^^ i + 3 * (f[i][0] + f[i][1] + f[i][2]);
        }
    }
    writeln(f[P][0] - 1);
}