Golden Ratio - Prolog?

Question

Prolog

Good day to all. You need to write a Prolog program that finds five points on a person's hand. The length of the first phalanx and the length of the second phalanx are given as initial data. Sketched something, of course, with errors. Tell me how to be?

main:-
predicates:
f(byte,word).
clauses:
f(1,10).
f(2,14).
f(N,F):-N1=N-1,f(N1,F1),N2=N1-1,f(N2,F2),F=F1+F2.
goal:
f(5,point).