SELECT COUNT ( DISTINCT t1.keyword ) FROM publication_keyword AS t5 JOIN keyword AS t1 ON t5.kid  =  t1.kid JOIN publication AS t3 ON t3.pid  =  t5.pid JOIN writes AS t4 ON t4.pid  =  t3.pid JOIN author AS t2 ON t4.aid  =  t2.aid WHERE t2.name  =  "H. V. Jagadish";
return me the number of the keywords related to " H. V. Jagadish " .