#include "bits/stdc++.h"
using namespace std;

#define DEBUG(x) cout<<#x<<": "<<x<<endl;
#define DEBUG_VEC(v) cout<<#v<<":";for(int i=0;i<v.size();i++) cout<<" "<<v[i]; cout<<endl

typedef long long ll;
#define vi vector<int>
#define vl vector<ll>
#define vii vector< vector<int> >
#define vll vector< vector<ll> >
#define vs vector<string>
#define pii pair<int,int>
#define pis pair<int,string>
#define psi pair<string,int>
const int inf = 1000000001;
const ll INF = 1e16;
#define MOD 1000000007
#define mod 1000000009
#define pi 3.14159265358979323846
#define Sp(p) cout<<setprecision(15)<<fixed<<p<<endl;
int dx[4] = { 1,0,-1,0 }, dy[4] = { 0,1,0,-1 };
#define M 1000007

int main() {
	ll n, i, j;
	cin >> n;
	ll n1 = n / 2;
	ll n2 = n / 2 + 1;
	ll ans = max((n%M + (n%M)*(n1%M) - (n1%M)*(n1%M)) % M, (n%M + (n%M)*(n2%M) - (n2%M)*(n2%M)) % M);
	if (ans < 0) {
		for (i = 0; ans < 0; i++) {
			ans += M;
		}
	}
	cout << ans << endl;
}