Problem of the Week Problem D Not as Easy as 1, 2, 3

Zephaniah places the numbers $$1$$, $$2$$, and $$3$$ in the circles below so that each circle contains exactly one of $$1$$, $$2$$, and $$3$$, and any two circles joined by a line do not contain the same number. He then finds the sum of the numbers in the four circles on the far right. What sums could he achieve?