let fib(n: i32): i32 =
  if n <= 1 { n }
  else { fib(n - 1) + fib(n - 2) }

declare printf(s: cstring, ...): void
declare scanf(format: cstring, ...): i32

let main(): i32 = {
  let f9 = fib(9)
  
  printf("%d\n", f9)
  return 0
}