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+--
+-- Perl Weekly Challenge 227
+-- Task 1
+--
+-- See <https://perlweeklychallenge.org/blog/perl-weekly-challenge-227/>
+--
+
+CREATE SCHEMA IF NOT EXISTS pwc227;
+
+CREATE OR REPLACE FUNCTION
+pwc227.task1_plpgsql( y int)
+RETURNS int
+AS $CODE$
+DECLARE
+	fridays int := 0;
+	m int;
+BEGIN
+	FOR m IN 1 .. 12 LOOP
+	    IF extract( dow FROM make_date( y, m, 13 ) ) = 5 THEN
+	       fridays := fridays + 1;
+	    END IF;
+	END LOOP;
+
+	RETURN fridays;
+END
+$CODE$
+LANGUAGE plpgsql;