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

const int MOD = int(1e9) + 7;

long long N;

int int_pow(int v, long long p) {
  int r = 1;
  while (p) {
    if (p & 1LL) {
      r = 1LL * r * v % MOD;
    }
    p >>= 1;
    v = 1LL * v * v % MOD;
  }
  return r;
}

int main() {
  ios::sync_with_stdio(false);
  cin >> N;
  if (N == 1) {
    cout << 2 << endl;
  } else {
    int ans = 4LL * int_pow(5, N / 2 - 1) % MOD;
    if (N & 1) {
      ans = 3LL * ans % MOD;
    }
    cout << ans << endl;
  }
  return 0;
}