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

n = y
r = [0]*(n+1)
for i in range(1,n+1):
    v = i*i
    if v > n: break
    for j in range(n+1):
        if v+j*j > n: break
        r[v+j*j] += 1

print(max(r[x:y+1])*4)