# hankei root a, taikaku root b
a, b = map(int, input().split())
A = a ** 2
B = b ** 2

if a == b:
    ans = 4
elif a > b:
    ans = 0
elif 2 * a < b:
    ans = 0
elif 2 * a == b:
    ans = 4
else:
    ans = 8
print(ans)
# sqrt(a) *sprt 2 < sqrt(b)