#include <iostream>
#include <vector>

using namespace std;

vector<int> variationS;

int variations(int n) {
    if (n < 0) {
        return 0;
    }
    if (n == 0) {
        return 1;
    }
    if (variationS[n]) {
        return variationS[n];
    }
    variationS[n] = (2 * variations(n - 1) + 2 * variations(n - 3)) % 20210108;
    return variationS[n];
}

int main() {
    cin.sync_with_stdio(false);
    cin.tie(nullptr);

    int N;
    cin >> N;
    variationS.resize(N + 1);
    cout << variations(N) << '\n';
}