#include <iostream>
#include <cctype>
#include <algorithm>
#include <vector>
#include <map>
#include <queue>
#include <set>
#include <stack>
#include <utility>
#include <string>
#include <functional>
#include <cctype>
#include <cstring>
#include <cstdio>
#include <cstdlib>
#include <cmath>
#include <iomanip>
#include <bitset>
#define pb push_back
#define mp make_pair
#define YES cout<<"YES"<<endl
#define Yes cout<<"Yes"<<endl
#define NO cout<<"NO"<<endl
#define No cout<<"No"<<endl
#define INF (1<<30)
#define LLINF (1<<60)
#define MOD 1000000007
#define rep(i, n) for(int i=0;i<n;i++)
using ll = long long;
using namespace std;

int main(){
    cin.tie(0);
    ios::sync_with_stdio(false);

    ll n;
    cin >> n;
    int dp[10005][3] = {};
    dp[1][1] = 1;
    dp[1][0] = dp[1][2] = 0;
    for (int i = 2; i <= n; i++) {
        dp[i][0] = (dp[i - 1][1] + dp[i - 1][2])%MOD;
        dp[i][1] = dp[i - 1][0]%MOD;
        dp[i][2] = dp[i - 1][1]%MOD;
    }
    cout << (dp[n][0] + dp[n][1] + dp[n][2])%MOD << endl;
    return 0;
}