#include <cstdio>
#include <cstdlib>
#include <cmath>
#include <climits>
#include <cfloat>
#include <map>
#include <utility>
#include <set>
#include <iostream>
#include <memory>
#include <string>
#include <vector>
#include <algorithm>
#include <functional>
#include <sstream>
#include <complex>
#include <stack>
#include <queue>
#include <iomanip>
#include <array>
#include <numeric>
#include <regex>
#include <bitset>
#include <deque>

using namespace std;
typedef long long ll;
typedef pair<int, int> p_ii;

const int INF = 1e9;
const double PI = acos(-1.0);
const ll MOD = 1e9 + 7;

ll dp[2][2][1000010];

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

    cout<<(dp[0][0][n]+dp[0][1][n]+dp[1][0][n])%MOD<<endl;

    return 0;
}