sn = input()
n = int(sn)
if n < 2:
    print(-1)
else:
  l = len(sn)
  ln = int(sn[l-1])
  if ln % 2 == 0:
      if (n//2) % 2 == 1:
          print(-1)
      else:
          print(1)
  else:
      print(1)