#include<iostream>
using namespace std;

#define MAX 10000

int takeSpeed(int n){
  int i(1), c(0), tmp(0);

  while(n > 0){
    c += n%2;
  }

  return c;
}

int main(){
  int N, pos(1), speed(0), c=1;
  cin >> N;

  int check[N+1];
  for(int i=0;i<N+1;i++) check[i] = 0;

  while(pos != N){
    
    if(check[pos] == 1){
      c = -1;
      break;
    }
    cout <<"--MAIN WHILE--" << endl;
    check[pos] = 1;
    
    speed = takeSpeed(pos);
    if(pos + speed > N)speed *= -1;
    pos += speed;
    c++;
  }

  cout << c << endl;
  
  return 0;
}