How many numbers can we make?

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DECLARE @ table(v int, i int identity)

INSERT @ values(1),(5),(2),(3);

WITH C as(SELECT v u,1/i+1f,@@rowcount-sign(i-1)t FROM @
WHERE i in(1,@@rowcount)UNION ALL SELECT o,f+SIGN(t-i),t-i/t
FROM c JOIN @ ON i in(f,t)and f<=t 
CROSS APPLY(values(v*u),(v+u))p(o))SELECT
count(distinct u)FROM C WHERE f>t

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