#include <algorithm>
#include <cstdlib>
#include <iostream>
#include <vector>
#include <math.h>
using namespace std;
#define int long long
int MOD = 1000000007;
signed main() {
	int N;
	cin >> N;
	int res = 4;
	for (int i = 1; i < (N) / 2; i++) {
		res = (res * 5) % MOD;
	}
	if (N % 2 == 1) {
		res *= 3;
	}
	if (N == 1) res = 2;
	cout << res << endl;
	return 0;
}