If there may be less than 3 items..
try this:
=SUMPRODUCT(INDEX(LARGE(A1:A5,ROW($A$1:INDEX($A$1:$A$5,MIN(COUNT(A1:A5),3)))),0))
or...if there will ALWAYS be at least 3 items:
=SUMPRODUCT(LARGE(A1:A5,{1,2,3}))
Is that something you can work with?
Post back if you have more questions.
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Regards,
Ron (XL2003, Win XP)
Microsoft MVP (Excel)