(use srfi-1)
(define N (read))
(define A (list-tabulate N (^_ (read))))


(define (memorize f)
  (let ([cache (make-hash-table equal-comparator)])
    (lambda x
      (or (hash-table-get cache x #f)
          (let ([result (apply f x)])
            (hash-table-put! cache x result)
            result)))))

(let loop ([A A] [ht (hash-table-r7 'eqv? 0 1)])
  (cond
   [(null? A) (print (hash-table-fold ht (^(k v s) (remainder (+ s (*  k v)) 998244353)) 0))]
   [else
    (let ([nxt (make-hash-table)])
      (hash-table-for-each ht (^(k v)
                                (let ([a (remainder (+ k (car A)) 998244353)]
                                      [b (remainder (abs (- k (car A))) 998244353)])
                                  (hash-table-put! nxt a (+ v (hash-table-get nxt a 0)))
                                  (hash-table-put! nxt b (+ v (hash-table-get nxt b 0))))))
      (loop (cdr A) nxt))]))