// Járda I és L alakú járólapokkal.cpp : This file contains the 'main' function. Program execution begins and ends there.
//
#include <iostream>
#include <vector>
using namespace std;
int i, j, n;
int main()
{
cin >> n;
vector <unsigned long long> x(n + 4);
x[0] = 1;
x[1] = 1;
x[2] = 2;
x[3] = 5;
for (i = 4; i <= n; ++i)
{
x[i] = x[i - 1] + x[i - 2];
for (j = 0; j <= i-3; ++j)
{
x[i] += 2*x[j];
}
}
cout << x[n];
return 0;
}
// Run program: Ctrl + F5 or Debug > Start Without Debugging menu
// Debug program: F5 or Debug > Start Debugging menu
// Tips for Getting Started:
// 1. Use the Solution Explorer window to add/manage files
// 2. Use the Team Explorer window to connect to source control
// 3. Use the Output window to see build output and other messages
// 4. Use the Error List window to view errors
// 5. Go to Project > Add New Item to create new code files, or Project > Add Existing Item to add existing code files to the project
// 6. In the future, to open this project again, go to File > Open > Project and select the .sln file