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

int mod = 1e9 + 7;

int main(void) {
    int n;
    cin >> n;
    ll ans = 4;
    ll temp = 1;
    if (n==1) {
        cout << 2 << endl;
        return 0;
    }
    for (int i=0; i<n/2-1; i++) {
        temp *= 5;
        temp %= mod;
    }
    ans *= temp;
    if (n%2 != 0) ans *= 3;
    cout << ans%mod << endl;
    return 0;
}