def ip():return int(input())
def mp():return map(int, input().split())
def lmp():return list(map(int, input().split()))
# 岩プロコン2 F No.3264 岩井数
N = ip()
i = 1000
M = 10**9
while True:
  si = str(i)
  ti = int(si + si[::-1] + '9')
  L = len(si)
  if ti >= M and ((i % N) * (10 ** (L+1) % N) + (int(si[::-1]) % N * 10 % N) + 9) % N == 0:
    print(ti)
    exit()
  for j in range(10):
    ti = int(si + str(j) + si[::-1] + '9')
    if ((i % N) * (10 ** (L+2) % N) + (j * 10 ** (L+1) % N) + (int(si[::-1]) % N * 10 % N) + 9) % N == 0:
      print(ti)
      exit()
  i += 1