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+--
+-- Perl Weekly Challenge 261
+-- Task 2
+-- See <https://perlweeklychallenge.org/blog/perl-weekly-challenge-261>
+--
+
+CREATE SCHEMA IF NOT EXISTS pwc261;
+
+CREATE OR REPLACE FUNCTION
+pwc261.task2_plpgsql( s int, nums int[] )
+RETURNS int
+AS $CODE$
+DECLARE
+
+BEGIN
+	LOOP
+		PERFORM s
+		FROM unnest( nums ) n
+		WHERE n::int = s;
+
+		IF FOUND THEN
+		   s := s * 2;
+		ELSE
+		  RETURN s;
+		END IF;
+	END LOOP;
+
+END
+$CODE$
+LANGUAGE plpgsql;