#include<stdio.h>
#include<iostream>
#include<algorithm>
#include<vector>
#include<string>
#include<utility>
#include<map>
#include<set>
#include<queue>
#include<stack>
#include<functional>
#include<math.h>
#include<random>
#include <bitset>
#include <cassert>
#include <complex>
using namespace std;
#define N (1000000000+7)
//#define N 998244353
#define INF 1e16
typedef long long ll;
typedef pair<ll,ll> P;
typedef pair<int,P> Q;

ll dp[1000010][3];

int main() {
    int n;
    cin>>n;
    dp[0][0]=1;
    for(int i=0;i<n;i++){
        dp[i+1][0] = (dp[i+1][0]+(dp[i][1]+dp[i][2])%N)%N;
        dp[i+1][1] = (dp[i][0]+dp[i+1][1])%N;
        dp[i+1][2] = (dp[i+1][2]+dp[i][1])%N;
    }
    ll ans = ((dp[n][0]+dp[n][1])%N+dp[n][2])%N;
    cout<<ans<<endl;
}