//
//
//  Codeforces: ganariya
//  AtCoder: ganariya2525
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//include
//------------------------------------------
#include <vector>
#include <list>
#include <map>
#include <unordered_map>
#include <climits>
#include <set>
#include <unordered_set>
#include <deque>
#include <stack>
#include <bitset>
#include <algorithm>
#include <functional>
#include <numeric>
#include <utility>
#include <sstream>
#include <iostream>
#include <iomanip>
#include <cstdio>
#include <cmath>
#include <cstdlib>
#include <cctype>
#include <string>
#include <cstring>
#include <ctime>
#include <queue>
#include <random>
#include <complex>
#include <regex>
#include <locale>
#include <random>
#include <type_traits>

using namespace std;

#define SHOW_VECTOR(v) {std::cerr << #v << "\t:";for(const auto& xxx : v){std::cerr << xxx << " ";}std::cerr << "\n";}
#define SHOW_MAP(v){std::cerr << #v << endl; for(const auto& xxx: v){std::cerr << xxx.first << " " << xxx.second << "\n";}}

using LL = long long;

//~~~~~~~~~~~~~~~~~~~~~_(＾～＾ ｣ ∠)_~~~~~~~~~~~~~~~~~~~~~

constexpr LL mod = 1e9 + 7;

long long dp[101][4][4][4];

int main() {

    int N;
    cin >> N;

    dp[0][3][3][3] = 1;
    for (int i = 0; i < N; i++) {
        for (int c1 = 0; c1 < 4; c1++) {
            for (int c2 = 0; c2 < 4; c2++) {
                for (int c3 = 0; c3 < 4; c3++) {
                    for (int a = 0; a < 4; a++) {
                        if (c2 == 0 && c3 == 1 && a == 2) continue;
                        if (c2 == 0 && c3 == 2 && a == 1) continue;
                        if (c2 == 1 && c3 == 0 && a == 2) continue;
                        if (c1 == 0 && c2 == 1 && a == 2) continue;
                        if (c1 == 0 && c3 == 1 && a == 2) continue;
                        dp[i + 1][c2][c3][a] += dp[i][c1][c2][c3];
                        dp[i + 1][c2][c3][a] %= mod;
                    }
                }
            }
        }
    }

    LL ans = 0;
    for (int c1 = 0; c1 < 4; c1++) {
        for (int c2 = 0; c2 < 4; c2++) {
            for (int c3 = 0; c3 < 4; c3++) {
                ans += dp[N][c1][c2][c3];
                ans %= mod;
            }
        }
    }

    cout << ans;

    return 0;
}










































Measured memory_bytes: 256