#include <iostream>
#include <vector>
#include <algorithm>
using namespace std;
typedef long long int ll;

ll mod=1e9+7;

int main(){
	cin.tie(nullptr);
	ios::sync_with_stdio(false);
	ll n; cin >> n;
	n-=4;
	ll ans=0;
	if(n%6==0){
		ll m=n/6;
		m%=mod;
		ans+=3*m*m%mod;
		ans+=3*m%mod;
		ans++;
		ans%=mod;
	}
	else{
		ll m=n/6;
		m%=mod;
		ll k=n%6;
		ans=(3*m+k)%mod*(m+1)%mod;
	}
	cout << ans << endl;
}