Question: Fibbonacci numbers in Maple

Need to create a fibonacci defintiion using this form..Any help appreciated..thanks in advance

The Fibonacci numbers Fn are defined for all positive integers n as follows:

Fn = ( 1,                 n =1, 2 , )    

      (Fn−1 + Fn−2 , otherwise.)

 Complete the definition of fib so that fib(n) returns Fn for all positive integers n. You must compute Fn using the below definition! A recursive proc is most natural.

fib:=
proc(n::posint)
description "Calculate fib(n), the n'th Fibonacci number.";
option remember; # important for efficiency!
---MORE STUFF HERE---
end proc; # fib

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