import sys
read = sys.stdin.buffer.read
readline = sys.stdin.buffer.readline
readlines = sys.stdin.buffer.readlines

import numpy as np

X,Y = map(int,read().split())

U = int(10 ** 3.5 + 10)
x = np.arange(-U,U,dtype=np.int32)

sq = x * x
values = sq[:,None] + sq[None,:]
counter = np.bincount(values.ravel(), minlength=10**7+10)

answer = counter[X:Y+1].max()
print(answer)