#include <iostream>
#include <string>
#include <vector>
#include <queue>
#include <deque>
#include <algorithm>
#include <set>
#include <map>
#include <bitset>
#include <cmath>
#include <functional>
#include <iomanip>
#define vll vector<ll>
#define vvvl vector<vvl>
#define vvl vector<vector<ll>>
#define VV(a, b, c, d) vector<vector<d>>(a, vector<d>(b, c))
#define VVV(a, b, c, d) vector<vvl>(a, vvl(b, vll (c, d)));
#define re(c, b) for(ll c=0;c<b;c++)
#define all(obj) (obj).begin(), (obj).end()
typedef long long int ll;
typedef long double ld;
using namespace std;

#define P 1000000007
#define N_MAX 100
ll fac[N_MAX+1], inv[N_MAX+1], finv[N_MAX+1];
ll comb(ll n, ll k){
  if(n<0||k<0||n<k) return 0;
  return (((fac[n]*finv[n-k])%P)*finv[k])%P;
}
ll perm(ll n, ll k){
  if(n<0||k<0||n<k) return 0;
  return (fac[n]*finv[n-k])%P;
}
void init(){
  fac[0] = finv[0] = fac[1] = finv[1] = inv[1] = 1;
  for(int i = 2; i <= N_MAX; i++){
    fac[i] = (fac[i-1]*i)%P;
    inv[i] = ((-(P/i)*inv[P%i])%P+P)%P;
    finv[i] = (finv[i-1]*inv[i])%P;
  }
}
ll mpow(ll a, ll b){
  ll ret = 1, num = a;
  while(b>0){
    if(b%2) ret = (ret*num)%P;
    num = (num*num)%P;
    b /= 2;
  }
  return ret;
}

struct ml{
  ll n;
  ml(ll n):n(n){}
  ml operator + (ml a){return (this->n + a.n)%P;}
  ml operator - (ml a){return (this->n - a.n + P)%P;}
  ml operator * (ml a){return (this->n * a.n)%P;}
  ml operator / (ml a){return (this->n*(a.n<=N_MAX?inv[a.n]:mpow(a.n,P-2)))%P;}
  ml operator + (ll a){return (this->n + a)%P;}
  ml operator - (ll a){return (this->n - a + P)%P;}
  ml operator * (ll a){return (this->n * a)%P;}
  ml operator / (ll a){return (this->n*(a<=N_MAX?inv[a]:mpow(a,P-2)))%P;}
  ml operator ^ (ll a){return mpow(this->n, a);}

  void operator += (ml a){n = (this->n + a.n)%P;}
  void operator -= (ml a){n =  (this->n - a.n + P)%P;}
  void operator *= (ml a){n =  (this->n * a.n)%P;}
  void operator /= (ml a){n = (this->n*(a.n<=N_MAX?inv[a.n]:mpow(a.n,P-2)))%P;}
  void operator += (ll a){n =  (this->n + a)%P;}
  void operator -= (ll a){n = (this->n - a + P)%P;}
  void operator *= (ll a){n =  (this->n * a)%P;}
  void operator /= (ll a){n = (this->n*(a<=N_MAX?inv[a]:mpow(a,P-2)))%P;}
  void operator ^= (ll a){n = mpow(this->n, a);}
};
int main(int argc, char const *argv[]) {
  ll n;std::cin >> n;
  init();
  ml N(n);
  ml ans = (N-2)*(N-3)/2;
  if((n-1)%3==0) ans += 2;
  ll ad = ((n-4)/2 + 1)%P;
  ml x(ad);
  ad *= 3;
  ans += ad;
  std::cout << (ans/6).n << '\n';
  return 0;
}