Running Total with a Set Maximum

Hi,
Could someone out there help me.
Given the following set of values
+3
+3
0
+3
+3
-3
0
+3

I want to have a maximum sum of 6 at any one point , in other words I want the following


+3 -- 3
+3 -- 6
0 -- 6
+3 -- 6
+3 -- 6
-3 -- 3
0 -- 3
+3 -- 6

How can I do this ?

Thank you

Paul Newman

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