current players of hartpury college r . f . c . have previously played for how many different teams ?
SELECT DISTINCT COUNT attr_open var_uri attr_close where brack_open var_x dbo_team dbr_Hartpury_College_R.F.C sep_dot sep_dot var_x dbo_formerTeam var_uri sep_dot var_uri a dbo_SportsTeam brack_close