import java.util.Scanner;
class Main{
    public static void main(String[] args){
        Scanner sc = new Scanner(System.in);
        long H = sc.nextLong();
        long count = 0;

        while (H > 1) {
            H /= 2;
            count++;
        }
        // System.out.println("count: " + count);

        long node = 0;
        for (int i = 1; i <= count; i++) {
            node += Math.pow(2,i);
        }

        System.out.println(node+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