import java.util.Scanner;

public class Main {
	public static void main(String[] args){
		try(Scanner sc = new Scanner(System.in)) {
			
			long h = sc.nextLong();
			
			
			System.out.println(countTurn(h));

		}
			
	}
	
	static private long countTurn(long hp) {
		
		if ( hp == 1 ) {
			return 1;
		}
		else {
			return 2 * countTurn(hp / 2) + 1;
		}
	}
}
/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