def is_iwi(x):
    if x % 10 != 9:
        return False
    xx = str(x)[:-1]
    return xx == xx[::-1]

Ns = input()
N = int(Ns)
L = len(Ns)

i = 10 ** L + 1
ans = N * i
assert is_iwi(ans)
if ans >= 10 ** 9:
    print(ans)
    exit()

s = 10 ** 9 // N
while True:
    if N * s >= 10 ** 9 and N * s % 10 == 9:
        break
    s += 1
for i in range(s, s + 10 ** 10, 10):
    if is_iwi(N * i):
        print(N * i)
        break