If there are no duplicates in your number list, then you can try:
@SMALL($A$1..$A$9,1)+@SMALL($A$1..$A$9,2)+@SMALL($A$1..$A$9,3)+@SMALL($A$1..$A$9,4)+@SMALL($A$1..$A$9,5)
If you organize your list of numbers in a column with a text header, then you can use a much simpler formula...