x, y = map(int, input().split())

i = 1
squ = []
while i * i <= y:
    squ.append(i * i)
    i += 1

cnt = {}
l = len(squ)
ans = 0
for s in [0] + squ:
    for q in squ:
        if x <= s + q <= y:
            cnt[s + q] = cnt.get(s + q, 0) + 1
            ans = max(ans, cnt[s + q])
            
print(4 * ans)