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

long long n, m;
const long long M = 1e9 + 7;

int main()
{
	cin >> n;

	m = n * (n + 1) % M;

	long long u = 1, v = 3, w = M - 2;

	while (w > 0) {
		if (w & 1)
			u = u * v % M;

		v = v * v % M;
		w >>= 1;
	}

	m = m * u % M;
	cout << m << endl;
}