#include <bits/stdc++.h> 
using namespace std;

#ifdef LOCAL
#define eprintf(...) fprintf(stderr, __VA_ARGS__)
#else
#define eprintf(...) 42
#endif

#define rep(i,n) for(int i=0;i<(int)(n);i++)
#define repi(i,a,b) for(int i=(int)(a);i<(int)(b);i++)
#define all(x) (x).begin(),(x).end()
#define foreach(u,v) for(auto (u) : (v))
#define pb push_back
#define mp make_pair
#define mt make_tuple

typedef long long ll;
typedef pair<int, int> pii;
typedef vector<int> vi;
typedef vector<vi> vvi;
typedef pair<ll, ll> pll;
typedef vector<ll> vl;

const int inf = 1e9;
const ll linf = 1LL<<60;
const ll mod = 1e9 + 7;
const double eps = 1e-9;

/*
*/

int main()
{
  int n;
  cin >> n;

  vector<vl> dp(n+1, vl(3));
  dp[0][0] = 1;
  rep(i, n){
    rep(j, 3){
      if(j+1 < 3){
        dp[i+1][j+1] += dp[i][j]; 
        dp[i+1][j+1] %= mod;
      }

      if(j){
        dp[i+1][0] += dp[i][j];
        dp[i+1][0] %= mod;
      }
    }
  }
  
  ll ans = 0;
  rep(i, 3){
    ans += dp[n][i];
    ans %= mod;
  }
  cout << ans << endl;

  return 0;
}