help using count in function

Perhaps this is simple, but it has me stumped.  What is the data type to use for returning a value from count?

Example:

CREATE FUNCTION ev3(int4) RETURNS int4
       AS 'Select count(id) from events where id = $1;' LANGUAGE 'sql';

ERROR:  return type mismatch in function declared to return integer

I’ve tried this with text, character, numeric, etc.  Nothing seems to work. 

Any ideas?

Thanks,

Ev