import java.util.*;

public class Main {
	private static long solve(long H) 
	{if(H==1) return 1;
	else return(2*solve(H/2)+1);
	}


	public static void main(String[] args) {
		Scanner sc =new Scanner(System.in);
		System.out.println(solve(sc.nextLong()));
	}
}
/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