#include "bits/stdc++.h"
using namespace std;
#define FOR(i,j,k) for(int (i)=(j);(i)<(int)(k);++(i))
#define rep(i,j) FOR(i,0,j)
#define each(x,y) for(auto &(x):(y))
#define mp make_pair
#define all(x) (x).begin(),(x).end()
#define debug(x) cout<<#x<<": "<<(x)<<endl
#define smax(x,y) (x)=max((x),(y))
#define smin(x,y) (x)=min((x),(y))
#define MEM(x,y) memset((x),(y),sizeof (x))
#define sz(x) (int)(x).size()
typedef long long ll;
typedef pair<int, int> pii;
typedef vector<int> vi;
typedef vector<ll> vll;
const int MOD = (int)1e9 + 7;
void sadd(int &a, int b){
    a += b;
    if(a >= MOD)a -= MOD;
    else if(a < 0)a += MOD;
}
int dp[1000001][3];
int main(){
    dp[0][0] = 1;
    int N; cin >> N;
    rep(i, N)rep(j, 3)if(dp[i][j]){
        if(j < 2)sadd(dp[i + 1][j + 1], dp[i][j]);
        if(j > 0)sadd(dp[i + 1][0], dp[i][j]);
    }
    int ans = 0;
    rep(i, 3)sadd(ans, dp[N][i]);
    cout << ans << endl;
}