
import java.util.Scanner;

public class Main {

	public static void main(String[] args) {
		// TODO 自動生成されたメソッド・スタブ
		   Scanner sc = new Scanner(System.in);
		    long H = sc.nextLong();
		    long Attack = 0;
		    long Monster = 1;
		    
		    while (H > 0) {
		      Attack += Monster;
		      H /= 2;
		      Monster *= 2;
		    }
		 
		    System.out.println(Attack);
		sc.close();
	}

}
/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