#define _USE_MATH_DEFINES
#include<iostream>
#include<vector>
#include<algorithm>
#include<cmath>
#include<string>
#include<iomanip>
#include<numeric>
#include<queue>
#include<deque>
#include<stack>
#include<set>
#include<map>
#include<random>
#include<bitset>
#include<cassert>
#include<complex>
#include<fstream>
#include<cstdlib>
#include<functional>
#include<array>
using namespace std;
typedef long long ll;
const int mod=1e9+7;
const int dx[]={1,0,0,-1},dy[]={0,1,-1,0};
ll mypow(int x,ll n){
	if(n==0)
		return 1;
	if(n%2==1)
		return mypow(x,n-1)*x%mod;
	ll res=mypow(x,n/2);
	return res*res%mod;
}
ll inv(int x){
	return mypow(x,mod-2);
}
int main(){
	int n;
	cin>>n;
	cout<<n*(n+1ll)%mod*inv(3)%mod<<endl;
}