1-- Compute fibonacci numbers 2 3FUN fib(n) = 4 IF n == 0 THEN 0 5 ELSE IF n == 1 THEN 1 6 ELSE fib(n - 1) + fib(n - 2) FI FI 7 8FUN main() = 9 LET n = READ() 10 IN 11 WRITE(fib(n)) 12