N=int(input())
count=0
A=list(map(int,input().split()))
for i in range(N):
  if A[i]<0:
    count+=1
if count>=2:
  print(0)
elif count==1:
  print(1)
else:
  grandy=[0]*64
  for x in range(1,64):
    B=set()
    for k in range(10):
      if (x>>k)&1:
        B.add(grandy[k])
    for y in range(64):
      if not y in B:
        grandy[x]=y
        break
  result=0
  for i in range(N):
    x=A[i]
    B=set()
    for k in range(64):
      if (x>>k)&1:
        B.add(grandy[k])
    for y in range(64):
      if not y in B:
        result^=y
        break
  if result==0:
    print(2)
  else:
    print(1)