Ackermann function

Please suggest an algorithm to me to solve it
I want to solve A(m,n)mod(10^20) for m,n>4 , say A(5,6)mod(10^20)

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What do you want to solve? There is no problem.

Ackermann is veryveryvery fast growing funcion

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What’s the question chad?

aah i got it. will be posting soon the solution for Ackermann function.