Need a modification of an existing EA. The modific concerns about inserting a lot management that increase lot at each take profit

I have an EA that trade at fixed lot. I need to modify it by inserting a money management that increases lot at each step (that is every time it reach a take profit) according to the following formula:

L(n)=M*(L(n-1)+X*fL (n-1))

where:

• (n) and (n-1)  indicate the step n and step n-1

• fL = P*equity  where equity is the equity of the account and P is  percentage (input parameter) that I want to use for the trade (it' is proportional to the risk I want to take)
  
• X is an input parameter (it can be also a negative floating number)
• M is an input parameter (positive floating number)