#include <iostream>

using namespace std;

typedef long long int ll;

int main() {
    int P;
    cin >> P;
    ll dp[3][2] = {{0}};
    dp[0][0] = 1;
    for (int i = 0; i < P; i++) {
        ll newdp[3][2] = {{0}};
        for (int j = 0; j < 3; j++) {
            for (int k = 0; k <= 9; k++) {
                if (k == 3) {
                    newdp[(j + k) % 3][1] += dp[j][0];
                } else {
                    newdp[(j + k) % 3][0] += dp[j][0];
                }
                newdp[(j + k) % 3][1] += dp[j][1];
            }
        }
        for (int j = 0; j < 3; j++) {
            for (int k = 0; k < 2; k++) {
                dp[j][k] = newdp[j][k];
            }
        }
    }

    cout << (dp[0][0] + dp[0][1] + dp[1][1] + dp[2][1]) - 1 << endl;
    return 0;
}