/* -*- coding: utf-8 -*-
 *
 * 557.cc: No.557 点対称 - yukicoder
 */

#include<cstdio>
#include<cstdlib>
#include<cstring>
#include<cmath>
#include<iostream>
#include<string>
#include<vector>
#include<map>
#include<set>
#include<stack>
#include<list>
#include<queue>
#include<deque>
#include<algorithm>
#include<numeric>
#include<utility>
#include<complex>
#include<functional>
 
using namespace std;

/* constant */

typedef long long ll;
const ll MOD = 1000000007;

/* typedef */

/* global variables */

/* subroutines */

/* main */

int main() {
  int n;
  cin >> n;

  if (n == 1) puts("2");
  else {
    int nh = n / 2;
    ll p = 4;
    for (int i = 1; i < nh; i++) p = (p * 5) % MOD;
    if (n & 1) p = (p * 3) % MOD;

    printf("%lld\n", p);
  }
  return 0;
}