#include <iostream>
#include <vector>
#include <queue>
#include <stack>
#include <set>
#include <map>
#include <limits.h>
#include <algorithm>
#include <math.h>

using namespace std;

int main()
{
	iostream::sync_with_stdio(0);
	cin.tie(0);

	int n, x;
	cin >> n;

	vector<int> vec(3);
	vec[1] = 3;
	vec[2] = 10;
	for (int i = 3; i <= n; i++)
	{
		x = vec[i - 2] + 3 * vec[i - 1];
		vec.push_back(x % 20210108);
	}
	
	cout << vec[n];
}