(defun f (n)
  (if (>= 0 n)
    1
    (- n (m (f (- n 1))))))

(defun m (n)
  (if (>= 0 n)
    0
    (- n (f (m (- n 1))))))

(each ((n (range 0 15)))
  (format t "f(~s) = ~s; m(~s) = ~s\n" n (f n) n (m n)))