#include <bits/stdc++.h>

using namespace std;
typedef long long ll;
typedef vector<int> VI;
typedef vector<VI> VVI;
typedef vector<ll> VL;
typedef vector<VL> VVL;
typedef pair<int, int> PII;

#define FOR(i, a, n) for (int i = (int)a; i < (int)n; ++i)
#define REP(i, n) FOR(i, 0, n)
#define ALL(x) x.begin(), x.end()
#define MOD 1000000007
#define INF 1000000000
#define PI 3.14159265359
#define EPS 1e-12

int dp[1000010][4];

int main(void)
{
  int n;
  cin >> n;

  dp[1][1] = 1;
  FOR(i, 2, n+1) {
    dp[i][0] = (dp[i-1][1] + dp[i-1][2]) % MOD;
    dp[i][1] = dp[i-1][0];
    dp[i][2] = dp[i-1][1];
  }

  int ans = 0;
  REP(i, 3) ans = (ans + dp[n][i]) % MOD;
  cout << ans << endl;

  return 0;
}