SELECT count(*) FROM country WHERE country_id NOT IN ( SELECT country_id FROM roller_coaster WHERE LENGTH  >  3000 )
How many countries do not have an roller coaster longer than 3000?
[Schema (values) (types)]: | roller_coaster |  roller_coaster : roller_coaster_id (text) , name (number) , park (text) , country_id (text) , length (number) , height (number) , speed (number) , opened (text) , status (text) | country : country_id (text) , name (number) , population (text) , area (text) , languages (number);