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

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

long long N;

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