import java.util.*;
public class Main {

  public static void main(String[] args) { 
      Scanner sc = new Scanner(System.in);
      long n = sc.nextLong();

      System.out.println(recursive(n));
  }

  static Map<Long, Long> cache = new HashMap<>();
  
  private static long recursive(long n) {
    if(cache.containsKey(n))
      return cache.get(n);
    if(n == 1)
      return 1;

    long sum = recursive(n / 2) * 2 + 1;

    cache.put(n, sum);
    return sum;
  }
}
/tmp/hf-datasets-cache/medium/datasets/42704881117311-config-parquet-and-info-qiankunmu-Project_CodeNet-896c9d36/hub/datasets--qiankunmu--Project_CodeNet_Python800_and_Java250/snapshots/c899fde44a77ba1cc14973ed3de064e4ff3aadc7/Project_CodeNet_Java250.tar.gz