Count the male actors born in USA that starred in Ghost.
male refers to Gender = 'Male'; born in USA refers to Birth Country = 'USA'; Ghost refers to Title = 'Ghost'
SELECT COUNT(*) FROM movie AS T1 INNER JOIN characters AS T2 ON T1.MovieID = T2.MovieID INNER JOIN actor AS T3 ON T3.ActorID = T2.ActorID WHERE T1.Title = 'Ghost' AND T3.Gender = 'Male' AND T3.`Birth Country` = 'USA'