from collections import *

X, Y = map(int, input().split())
L = []
D = defaultdict(int)
i = 1
while i * i <= Y:
    L.append(i * i)
    D[i * i] += 1
    i += 1

for a in L:
    for b in L:
        if X <= a + b <= Y:
            D[a + b] += 1
        
ans = 0
for k, v in D.items():
    if X <= k <= Y:
        ans = max(ans, v)
print(ans * 4)