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

template <class A, class B> bool cmin(A& a, B b) { return a > b && (a = b, true); }
template <class A, class B> bool cmax(A& a, B b) { return a < b && (a = b, true); }

signed main() {
  cin.tie(nullptr)->sync_with_stdio(false);

  long N;
  cin >> N;

  long ans = 1;
  while ((long double)ans * 2 <= N) ans *= 2;
  cout << ans << '\n';
}