// járdakövezés.cpp : This file contains the 'main' function. Program execution begins and ends there.
//

#include <iostream>
#include <vector>

using namespace std;

int main()
{

	int k;
	cin >> k;

	vector<int> variaciok{ 2,4,10 };

	for (size_t i = 3; i < k; i++)
	{
		variaciok.push_back(2*(variaciok[i - 1] + variaciok[i - 3]) % 20210108);
	}
	cout << variaciok[k - 1];
}

// 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