// I SELL YOU...! 
#include<iostream>
#include<vector>
#include<algorithm>
#include<functional>
#include<queue>
#include<chrono>
#include<iomanip>
#include<map>
#include<set>
using namespace std;
using ll = long long;
using P = pair<ll,ll>;
using TP = tuple<ll,ll,ll>;
void init_io(){
  cin.tie(0);
  ios::sync_with_stdio(false);
  cout << setprecision(18);
}
#define MOD 1000000007
signed main(){
  init_io();
  ll n;
  cin >> n;
  ll dp[n+1][3];
  fill(dp[0],dp[n+1],0);
  dp[1][0] = 0;
  dp[1][1] = 1;
  dp[1][2] = 0;
  for(int i=1;i<n;i++){
    dp[i+1][0] = (dp[i][1]+dp[i][2]) % MOD;
    dp[i+1][1] = (dp[i][0]);
    dp[i+1][2] = dp[i][1];
  }
  ll ans = (dp[n][0]+dp[n][1])%MOD + dp[n][2];
  ans %= MOD;
  cout << ans << endl;
}