Transform If Code to Formula

if value in Column "N"<0 then
cost avoidance = 0

if value in Column "U" = "Services" then
A = market price USD - Line Amount USD
if A < 0 then
A = List Price - Line Amount USD
end if

if A still < 0 then
replace all -ve value = 0
end if

else if value in Column "U" <> "Services" then
A = (market price - unit price)*Qty
if A < 0 then
A = (list price - unit price)*Qty
end if

if A still < 0 then
replace all -ve value = 0
end if

I would like to transform this code to an IF formula instead of looping. This code is going to place only in one cell. Anyone can help me for this thing?

Services = col "U"
market price = col "AL"
list price = col "AM"
list amount = col "AN"

if at the end, there is still negative value in cells, it will replace with "0".