#include <bits/stdc++.h>
#define DIV 1000000007

using namespace std;

int N;
int dp[3][2][1000001] = {{{0}}};

int rec(int ken = 0, int pa = 0, int count = 0){
    
    if(count == N) return 1;
    
    int &res = dp[ken][pa][count];
    if(res != 0) return res;
    
    if(ken < 2){
        res += rec(ken + 1, 0, count + 1);
        res %= DIV;
    }
    if(ken != 0 && pa == 0){
        res += rec(0 , 1, count + 1);
        res %= DIV;
    }
    
    return res;    
}

int main(void){
    
    cin >> N;
    
    cout << rec() << endl;
    
    return 0;
}