#include <bits/stdc++.h>
using namespace std;
using Pi = pair<int, int>;
using ll = long long;
const int INF = 1 << 28;
string to_string(string s) { return s; }
template <class T>
string to_string(vector<T> v) {
  string ret = "{";
  for (int i = 0; i < v.size() - 1; ++i) {
    ret += to_string(v[i]) + ",";
  }
  if (v.size() > 0) {
    ret += to_string(v.back());
  }
  ret += "}";
  return ret;
}
void debug() { cerr << endl; }
template <class Head, class... Tail>
void debug(Head head, Tail... tail) {
  cerr << to_string(head) << " ";
  debug(tail...);
}
void print() { cout << endl; }
template <class Head, class... Tail>
void print(Head head, Tail... tail) {
  cout << to_string(head);
  print(tail...);
}
void get() {}
template <class Head, class... Tail>
void get(Head& head, Tail&... tail) {
  cin >> head;
  get(tail...);
}
template <class T>
void getv(vector<T>& vec) {
  for (int i = 0; i < vec.size(); ++i) cin >> vec[i];
}
int main() {
  int P;
  get(P);
  ll X = 1;
  set<ll> list;
  while (P-- > 0) {
    list.insert(X);
    if ((X - 1) % 3 == 0 && ((X - 1) / 3) % 2 == 1 &&
        list.count((X - 1) / 3) == 0) {
      X = (X - 1) / 3;
    } else {
      X *= 2;
    }
  }
  print(X);
  return 0;
}
