#include <bits/stdc++.h>
using namespace std;
#define FOR(i, n) for(int i = 0; i < (n); i++)
#define MEM(a, x) memset(a, x, sizeof(a))
#define ALL(a) a.begin(), a.end()
#define UNIQUE(a) a.erase(unique(ALL(a)), a.end())
typedef long long ll;
typedef pair<int, int> P;

int n;
ll MOD = 1000000007;

int main(int argc, char const *argv[]) {
	ios_base::sync_with_stdio(false);
	cin >> n;
	if (n == 1) cout << 2 << endl;
	else {
		ll ret = 4;
		FOR(i, n/2-1) ret = ret * 5 % MOD;
		if (n & 1) ret = ret * 3 % MOD;
		cout << ret << endl;
	}
	return 0;
}