import java.util.Scanner;
import java.util.Arrays;

public class Main{
  public static void main(String args[]){
    Scanner sc = new Scanner(System.in);
    long h = sc.nextLong();
    int a = 0;
    long ans = 1;
    int i = 1;
    while(h != 1){
      h /= 2;
      ans += (long)(Math.pow(2,i));
      i++;
    }
    System.out.println(ans);    
  }
}
/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