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

int main() {
  long long N;
  cin >> N;
  for (int i = 59; i >= 0; --i) {
    if (N & (1LL << i)) {
      long long ans = 1LL << i;
      cout << ans << endl;
      break;
    }
  }
}