#include <bits/stdc++.h>
#define syosu(x) fixed<<setprecision(x)
using namespace std;
typedef long long ll;
typedef unsigned long long ull;
typedef pair<int,int> P;
typedef pair<double,double> pdd;
typedef pair<ll,ll> pll;
typedef vector<int> vi;
typedef vector<vi> vvi;
typedef vector<double> vd;
typedef vector<vd> vvd;
typedef vector<ll> vl;
typedef vector<vl> vvl;
typedef vector<string> vs;
typedef vector<P> vp;
typedef vector<vp> vvp;
typedef vector<pll> vpll;
typedef pair<int,P> pip;
typedef vector<pip> vip;
const int inf=1<<30;
const ll INF=1ll<<60;
const double pi=acos(-1);
const double eps=1e-9;
const ll mod=1e9+7;
const int dx[4]={0,1,0,-1},dy[4]={1,0,-1,0};

const int M=1000005;
ll dp[M][4],n;

int main(){
	cin>>n;
	for(int i=1;i<=M;i++){
		if(i<=3) dp[i][i]++;
		for(int j=1;j<=3;j++) for(int k=1;k<=3;k++) if(j!=k&&i>j) (dp[i][j]+=dp[i-j][k])%=mod;
	}
	cout<<(dp[n][1]+dp[n][2]+dp[n][3])%mod<<endl;
}