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How can I formulate the following idea?
I have p (parameter). I want to know how many times I need to divide it by 2 until the result of the division is around d.
For example, let p = 400 and d = 25. I need to divide it 4 times by 2 to get d ~ 20.
Trivial: d*2^n = p, hence n = log(p/d)/log(2). Then just round up n in the direction you want.