#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;
  N--;
  for(int i = 0; i < N; i++) {
    dp[i+1][1] += dp[i][0];
    dp[i+1][2] += dp[i][1];
    dp[i+1][0] += dp[i][1];
    dp[i+1][0] += dp[i][2];
    dp[i+1][0] %= 1000000007;
    dp[i+1][1] %= 1000000007;
    dp[i+1][2] %= 1000000007;
  }
  ll ans = (dp[N][0] + dp[N][1] + dp[N][2]) % 1000000007;
  cout << ans << endl;

}