Find the Algorithm

[mcr4ck]

I didn't understand anything from the formula
I think it's flawed
On the other hand, the numbers that are written together are calculated by a formula
That is, they are separate
0101=70f5
or
de50=2c8c
or
0102=dde2
or
ffff=5967

Here's the formula for calculating this
That is to say, if we give an input to these numbers, give me an output according to the numbers above.

for example:

in 0101 ==> out 70f5
or

in de50 ==> out 2c8c

or
in 0102 ==> out dde2