#include <iostream>
using namespace std;
const int mod = 1000000007;
int modpow(int a, long long b) {
	int ret = 1;
	while (b) {
		if (b & 1) ret = 1LL * ret * a % mod;
		a = 1LL * a * a % mod;
		b >>= 1;
	}
	return ret;
}
long long n;
int main() {
	cin >> n;
	if (n == 1) cout << 2 << endl;
	else {
		int ret = 4LL * modpow(5, n / 2 - 1) % mod;
		if (n % 2 == 1) ret = 3LL * ret % mod;
		cout << ret << endl;
	}
	return 0;
}