#include <bits/stdc++.h>
using namespace std;
long long f(long long x, int N){
  long long sum = 0;
  for (int i = 0; i < N; i++){
    sum += x;
    x /= 2;
  }
  return sum;
}
int main(){
  long long D;
  cin >> D;
  long long ans = D;
  for (int i = 1; i <= 100; i++){
    long long tv = D;
    long long fv = 0;
    while (tv - fv > 1){
      long long mid = (tv + fv) / 2;
      if (f(mid, i) >= D){
        tv = mid;
      } else {
        fv = mid;
      }
    }
    if (f(tv, i) == D){
      ans = min(ans, tv);
    }
  }
  cout << ans << endl;
}