l,r = map(int,input().split())
if 1 <= l <= 295:
  one = 0
if 296 <= l <= 416:
  one = 1
if 417 <= l <= 420:
  one = 2
if 1 <= r <= 295:
  one -= 0
if 296 <= r <= 416:
  one -= 1
if 417 <= r <= 420:
  one -= 2
print(one*-1)