#include <bits/stdc++.h>
using namespace std;
using pii = pair<int, int>;
const int MOD = 1e9 + 7;
int n;
int main() {
  ios_base::sync_with_stdio(false), cin.tie(0), cout << fixed;
  cin >> n;
  int dp[] = {1, 0};
  for (int i = 1; i < n; i++) dp[i % 2] = (dp[i % 2] + dp[1 - i % 2] + 1) % MOD;
  cout << (dp[0] + dp[1]) % MOD << endl;
  return 0;
}
