#include <bits/stdc++.h>

using namespace std;

const int MOD = (int)1e9 + 7;

long long int N;
long long int dp[1010101][3];

int main() {
  cin >> N;
  dp[1][0] = 0;
  dp[1][1] = 1;
  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;
}