Getting value of a row in psql

Question

I am running this command:

INSERT INTO groupmembers (memberid, groupid)

VALUES(60, SELECT get_groupid());

and I get this:

ERROR:  syntax error at or near "SELECT"

Running

SELECT get_groupid();

gives the following:

get_groupid
-----------
         61
(1 row)

I am trying to get get the value 61 but instead getting the row with that. How do I get the value inside that row instead?

This is what get_groupid looks like

CREATE FUNCTION get_groupdid() RETURNS int
AS $$ 
DECLARE 
groupid int;
BEGIN
SELECT groups.id INTO STRICT groupid
FROM groups WHERE name = 'Tier 1';
RETURN groupid;
END
$$ LANGUAGE plpgsql;

Answer 1

Just:

VALUES(60, get_groupid())