def alanum(x):
  lis = []
  while x != 0:
    lis.append(x % 10)
    x /= 10
  return lis

def pick(x, lis, out, a = 0):
  if x == 0:
    out.append([a, lis])
    return
  a *= 10
  for i in range(len(lis)):
    tmp = lis[:]
    tmpa = a + lis[i]
    tmp.pop(i)
    pick(x - 1, tmp, out, tmpa)

def isp(x):
  if x == 2:
    return True
  if x <= 1 or x & 1 == 0:
    return False
  for i in range(3, int(x ** 0.5) + 1, 2):
    if x % i == 0:
      return False
  return True

def main():
  n = 1489
  while 1:
    if isp(n):
      tmp = alanum(n)
      ttmp = []
      pick(4, tmp, ttmp)
      tt = []
      for ti in ttmp:
        tt.append(ti[0])
      #print n, tmp, tt
      while tt.count(n) > 0:
        tt.remove(n)
      for ii in tt:
        jj = 2 * ii - n
        if jj > 0 and isp(ii) and isp(jj) and tt.count(jj):
          return str(n) + str(ii) + str(jj) #(n, ii, jj)
    n += 1

print(main())