r, b = map(int, input().split())
t = r + b
if r > b:
    r, b = b, r

l_ = 0
r_ = t + 1
while r_ - l_ > 1:
    m = (l_ + r_) // 2
    if m * (m + 1) * (2 * m + 1) // 6 <= t:
        l_ = m
    else:
        r_ = m

m = l_
tt = l_ * (l_ + 1) * (2 * l_ + 1) // 6

dp = [1]
x = min(m, 100)
for x in range(1, x + 1):
    t = x * x
    dp += [0] * t
    for i in range(len(dp) - 1, t - 1, -1):
        dp[i] |= dp[i - t]

if r > len(dp):
    print(m)
    exit()

if m > 100:
    for i in range(200, len(dp)):
        dp[i] = 1
while r + b > tt and not dp[r]:
    r -= 1

if dp[r]:
    print(m)
else:
    print(m - 1)