#include <bits/stdc++.h>
using namespace std;
void __print(int x) { cerr << x; }
void __print(long x) { cerr << x; }
void __print(long long x) { cerr << x; }
void __print(unsigned x) { cerr << x; }
void __print(unsigned long x) { cerr << x; }
void __print(unsigned long long x) { cerr << x; }
void __print(float x) { cerr << x; }
void __print(double x) { cerr << x; }
void __print(long double x) { cerr << x; }
void __print(char x) { cerr << '\'' << x << '\''; }
void __print(const char *x) { cerr << '\"' << x << '\"'; }
void __print(const string &x) { cerr << '\"' << x << '\"'; }
void __print(bool x) { cerr << (x ? "true" : "false"); }
template <typename T, typename V>
void __print(const pair<T, V> &x) {
  cerr << '{';
  __print(x.first);
  cerr << ',';
  __print(x.second);
  cerr << '}';
}
template <typename T>
void __print(const T &x) {
  int f = 0;
  cerr << '{';
  for (auto &i : x) cerr << (f++ ? "," : ""), __print(i);
  cerr << "}";
}
void _print() { cerr << "]\n"; }
template <typename T, typename... V>
void _print(T &&t, V &&...v) {
  __print(t);
  if (sizeof...(v)) cerr << ", ";
  _print(v...);
}
long long MOD = 1e9 + 7;
int n;
long long powe(long long x, long long y) {
  long long ans = 1;
  for (int i = 1; i <= y; i++) {
    ans = (ans * x) % MOD;
  }
  return ans;
}
int main() {
  scanf("%d", &n);
  long long ans = 0, x = powe(3, 3 * n), y = powe(7, n);
  if (x < y) y -= MOD;
  ans = (x - y) % MOD;
  printf("%lld", ans);
  return 0;
}
