class Node:
  def __init__(self,v, p):
    self.val=v
    self.prev=p
    self.next=None

with open("mix.txt") as infile:
  items=[]
  head=None
  current=None
  for i, line in enumerate(infile):
    nn=Node(int(line)*811589153, current)
    items.append(nn)
    if head is None:
      head=nn
    else:
      current.next=nn
    current=nn
  current.next=head
  head.prev=current
  cnt=len(items)
  for mix in range(10):
    for item in items:
      if item.val==0:
        continue
      target=item
      rem=abs(item.val)%(cnt-1)
      for i in range(rem):
        if item.val<0:
          target=target.prev
        else:
          target=target.next
      if item.val > 0:
        target=target.next
      item.next.prev=item.prev
      item.prev.next=item.next
      tprev=target.prev
      tnext=target.next
      target.prev=item
      item.next=target
      item.prev=tprev
      tprev.next=item
  target=head
  while target.val != 0:
    target=target.next
  s=0
  for rep in range(3):
    for _ in range(1000):
      target=target.next
    s+= target.val

  print(s)