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+--
+-- Perl Weekly Challenge 251
+-- Task 1
+--
+-- See <https://perlweeklychallenge.org/blog/perl-weekly-challenge-251/>
+--
+
+CREATE SCHEMA IF NOT EXISTS pwc251;
+
+CREATE OR REPLACE FUNCTION
+pwc251.task1_plpgsql( nums int[] )
+RETURNS int
+AS $CODE$
+DECLARE
+	s text;
+	v int := 0;
+BEGIN
+	FOR i IN 1 .. array_length( nums, 1 ) - 1 LOOP
+	    IF i % 2 = 0 THEN
+	       CONTINUE;
+	    END IF;
+
+	    v := v + ( nums[ i ]::text || nums[ i + 1 ]::text )::int;
+	END LOOP;
+
+	RETURN v;
+END
+$CODE$
+LANGUAGE plpgsql;