def get_palindrome(num):
    return int(str(num)[::-1])


def is_palindrome(num):
    return get_palindrome(num) == num


if __name__ == '__main__':

    results = []
    for i in range(10, 10000):
        num = i + get_palindrome(i)
        counter = 0
        while counter < 50 and not is_palindrome(num):
            num += get_palindrome(num)
            counter += 1
        if not is_palindrome(num):
            results.append(i)
    print(len(results))