How many first round draft player in 1996 NBA draft became an All-Star?
first round refers to round = 1; in 1996 refers to year = 1996; NBA refers to lgID = 'NBA'
SELECT COUNT(T2.playerID) FROM draft AS T1 INNER JOIN player_allstar AS T2 ON T1.playerID = T2.playerID WHERE T1.draftYear = 1996 AND T1.draftRound = 1