#include <iostream>
using namespace std;
typedef long long ll;
const int mod=1e6+7;
int main(){
  ll n,x,y,z,a,b,c;
  cin>>n;
  y=0;
  for(ll i=n/2; i<=n/2+1; ++i){
    a=(n-i)%mod;
    b=(i+1)%mod;
    c=i%mod;
    x=a*b+c;
    if(x>=y){
      y=x;
    }
  }
  z=y%mod;
  cout<<z<<endl;
  return 0;
}