import sys
from collections import *
from functools import cache, partial
from itertools import *
from pprint import pprint
from typing import Any, Final

try:
    from icecream import ic
except ImportError:  # Graceful fallback if IceCream isn't installed.
    ic = lambda *a: None if not a else (a[0] if len(a) == 1 else a)  # noqa
debug = partial(print, file=sys.stderr)
dpprint = partial(pprint, stream=sys.stderr)
sys.setrecursionlimit(10 ** 6)
MOD=998244353

N: Final = int(input())
M = 10**10

s = (10**9 + N - 1) // N * N

for i in range(s, M, 10):
    v = str(i * N)
    s = v[:-1]
    if s == s[::-1]:
        print(v)
        break