How many users, who were a paying subscriber when they rated the movie, gave the movie that was released in 1924 and directed by Erich von Stroheim a rating score of 5?
Directed by Buster Keaton refers to director_name; released in 1924 refers to movie_release_year = 1924; paying subscriber refers to user_has_payment_method = 1


SELECT COUNT(T2.user_id) FROM movies AS T1 INNER JOIN ratings AS T2 ON T1.movie_id = T2.movie_id WHERE T1.movie_release_year = 1924 AND T1.director_name = 'Erich von Stroheim' AND T2.rating_score = 5 AND T2.user_has_payment_method = 1