R,B = map(int,input().split())
l = 1
r = 2000000
while r - l > 1:
  k = (l + r) // 2
  s = k*(k+1)*(2*k+1) // 6
  RR,BB = R,B
  for kk in range(k,0,-1):
    if RR >= kk*kk:
      RR -= kk*kk
      s -= kk*kk
  if s <= BB:
    l = k
  else:
    r = k
print(l)