N = int(input())
x = 10 ** 9 // N
a = -x % 10 + 1
x += a
f = True
while f:
    s = str(N * x)
    ns = len(s) - 1
    for i in range(ns//2):
        if s[i] != s[ns-i-1]:
            break
    else:
        f = False
    x += 10
print(s)