def find_factor(num):
    for x in range(999, 99, -1):
        if not (num % x):
            return x
    else:
        return 0

def make_palindrome():
    for x in range(999, 99, -1):
        s = str(x)
        yield int(s + s[::-1])

for x in make_palindrome():
    p = find_factor(x)
    if p:
        if 3 == len(str(x // p)):
            print(x)
            exit()