(defun main (&rest argv)
  (declare (ignorable argv))
  (let* ((n (read))
         (a (make-array 11 :element-type 'integer :initial-element 0))
         (s 0)
         (res 0))
    (loop for i from 1 below n do
          (setf (aref a i) (read))
          (incf s (aref a i)))
    (loop for i from 0 to 100
          when (zerop (mod (+ s i) n))
            do (incf res))
    (format t "~d~%" res)))

(main)