(import
  (scheme base)
  (scheme read)
  (scheme write)
)


(define (string-to-number c) (- (char->integer c) (char->integer #\0)))

(define (eval-string s)
  (let loop
    (
      (chars (string->list s))
      (r 0)
      (o 0)
      (l 0)
    )
    (cond
      ((null? chars)
        (if (= l 0)
          (+ r o)
          (* r o)))
      ((or (char=? (car chars) #\*) (char=? (car chars) #\+))
        (let
          (
            (new-r (if (= l 0) (+ r o) (* r o)))
            (new-l (if (char=? (car chars) #\*) 0 1))
          )
          (loop (cdr chars) new-r 0 new-l)))
      (else
        (let
          (
            (new-o (+ (* o 10) (string-to-number (car chars))))
          )
          (loop (cdr chars) r new-o l))))))

(define s (read-line))
(display (eval-string s))
(newline)