#include <bits/stdc++.h>
using namespace std;
int main(){
  vector<long long> A;
  A.push_back(1);
  for (int i = 1; i < 25; i++){
    long long X = ((long long) 5 << (i * 2 - 2)) - (1 << (i - 1)) ;
    A.push_back(X);
  }
  long long N;
  cin >> N;
  int M = 0;
  for (int i = 0; i < 25; i++){
    if (A[i] < N){
      M++;
    }
  }
  cout << N - M - 1 << endl;
}