def ala(x):
  tmp = 0
  while x != 0:
    tmp += x % 10
    x /= 10
  return tmp

def ist(x, i):
  if i == 1:
    return False
  if x < 10:
    return False
  while x != 1:
    if x % i != 0:
      return False
    x /= i
  return True

n = 2
count = []
while n < 100:
  for i in xrange(100):
    tmp = n ** i
    if ist(tmp, ala(tmp)):
      if count.count(tmp) == 0:
        count.append(tmp)
        count.sort()
  n += 1
print count[29]