def sum(m, n):
  return m * n * (m + 1) * (n + 1) / 4

maxx = 2000000
x = int((8 * maxx + 1) ** 0.5 / 2)
while sum(x, 1) < maxx: x += 1

orisub = abs(sum(x, 1) - maxx)
near = [orisub]
y = 1

while x > y:
  tmp = maxx
  y_lst = y
  while tmp > maxx - orisub and y > 0:
    tmp = sum(x, y)
    if abs(tmp - maxx) < near[0]:
      near = [abs(tmp - maxx), x, y]
    y -= 1
  x -= 1
  y = y_lst
  while sum(x, y) < maxx: y += 1

print near[1] * near[2]