#include <bits/stdc++.h>
using namespace std;
#include <atcoder/all>
using namespace atcoder;
using ll = long long;
#define rep(i, n) for (ll i = 0; i < (ll) (n); i++)
using mint = modint1000000007;
using vm = vector<mint>;
using vvm = vector<vm>;

int main() {
    ll N;
    cin>>N;
    vvm DP(N+100,vm(4,0));
    DP[0][1]=1;
    rep(i,N)rep(j,4)rep(k,2){
        ll b=j*2+k;
        if(b==0||b%4==3)continue;
        DP[i+1][b%4]+=DP[i][j];
    }
    mint an=0;
    rep(i,4)an+=DP[N][i];
    cout<<an.val()<<endl;
}