[Haskell-beginners] minimal Haskell concepts subset

Hello, which would be the minimal Haskell concepts subset equivalent to a Turing-complete high level language? I bet there would be no monads and type classes in the subset. Please, see that I am not an idealist nor want to use the acclaimed very powerful abstraction capabilities of Haskell. I just need to know how much is strictly needed, even if a real Haskeller or other person couldn't understand my code. Davi