#include <iostream>
#include <vector>
#include <math.h>
#include <stdio.h>
#include <algorithm>
#include <string>
#include <map>
#include <queue>
using namespace std;
#define ll long long

ll dp[1000001][3];
int main() {
  int N;
  cin >> N;
  dp[0][1] = 1;
  for(int i = 0; i < N; i++) {
    for(int j = 0; j < 3; j++) {
      if(j != 2) {
        dp[i+1][j+1] += dp[i][j];
        dp[i+1][j+1] %= 1000000007;
      }
      if(j != 0) {
        dp[i+1][0] += dp[i][j];
        dp[i+1][0] %= 1000000007;
      }
    }
  }
  ll ans = (dp[N-1][0] + dp[N-1][1] + dp[N-1][2]) % 1000000007;
  cout << ans << endl;

}