#!/usr/bin/python

import sys;

def isPalindrome(num):
	strNum = str(num);
	strNumRev = "";
	for x in range (len(strNum),0,-1):
		strNumRev += strNum[x-1];

	numRev = int(strNumRev);
	if(numRev == num):
		return True;

	return False;

cipherLength = int(sys.argv[1]);
higherPalindrome = -1;
for i in range (1*(10**(cipherLength-1)),1*(10**cipherLength)):
	for j in range (1*(10**(cipherLength-1)),1*(10**cipherLength)):
		num = i*j;
		if(isPalindrome(num)):
			if(num > higherPalindrome):
				higherPalindrome = num;
				
print "Result is: " + str(higherPalindrome);