l,r = map(int,input().split())
if l <= 295:
  if 417 <= r:
    print(2)
  elif 296 <= r:
    print(1)
  else:
    print(0)
elif l <= 416:
  if 417 <= r:
    print(1)
  else:
    print(0)
else:
  print(0)