Python Dimension.Below = calculated value based on actual Dimension value(Maths)

Revit
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12

Search for a value in "column A" of Excel and read the corresponding value in "column B" inspired me to take a different approach.

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new.append(‘Invalid’) ? how do i addapt this python in my graph?

import clr
clr.AddReference('RevitServices')
import RevitServices
from RevitServices.Persistence import DocumentManager
from RevitServices.Transactions import TransactionManager
doc = DocumentManager.Instance.CurrentDBDocument

dims = UnwrapElement(IN[0])
A = IN[1]
B = IN[2]

TransactionManager.Instance.EnsureInTransaction(doc)
for i in dims :
if i.Value >= 0 :
i.Below = "NEED HELP HERE"
else :
for j in i.Segments :
j.Below = "NEED HELP HERE"
TransactionManager.Instance.TransactionTaskDone()

#no Output is needed