Array performance

Hi,

I have a select like

SELECT (array[20]+array[21]+ ... +array[50]+array[51]) as total
FROM table
WHERE
(array[20]+array[21]+ ... +array[50]+array[51])<5000
AND array[20]<>0
AND array[21]<>0
 ...
AND array[50]<>0
AND array[51])<>0

Any ideas to make this query faster?