import java.util.*;
public class Main {
	public static void main(String[] args) {
		long H = new Scanner(System.in).nextLong(), ans = 1;
		for(int i = 0; i < (int) (Math.log(H) / Math.log(2)) + 1; i++)
			ans *= 2;
		System.out.println(ans-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