import java.util.*;

public class Main {
  public static void main(String[] args) {
    Scanner sc = new Scanner(System.in);
    long N = sc.nextLong();
    long normal = 0;
    long score = N;
    for(int i = 0; i < 61; i++) {
      if(score > 0) {
        normal += score;
        score /= 2;
      } else {
        break;
      }
    }
    long skill = 0;
    for(int i = 0; i < 61; i++) {
      score = N;
      long a = 0;
      for(int j = 0; j < i; j++) {
        a += score;
        score /= 2;
      }
      a += (2 * score);
      skill = Math.max(skill, a);
    }
    System.out.println(skill - normal);
  }
}