(define (System.out.println x)
  (begin
    (display x)
    (newline)
  )
)

(let (
      (N (read))
     )
  (let loop(
            (foo (read))
            (Odd 0)
            (Even 0)
           )
    (if (eof-object? foo)
        (System.out.println (abs (- Odd Even)))
        (if (= (modulo foo 2) 0)
            (loop (read) Odd (+ Even 1))
            (loop (read) (+ Odd 1) Even)
        )
    )
  )
)