/* package whatever; // don't place package name! */
 
import java.util.*;
import java.lang.*;
import java.io.*;
 
/* Name of the class has to be "Main" only if the class is public. */
class Ideone
{
	public static void main (String[] args) throws java.lang.Exception
	{
		long pal = 0;
		for(long i = 999; i >= 100; i--) { //Practice: 99 * 99
		    for(long j = 999; j >= 100; j--) {
		        long k = i * j; // 9801 999*999 ~= 999006
		        String normal = String.valueOf(k);//String(9801)
		        String palindrome = new StringBuffer(normal).reverse().toString();//String(1089)
		        if (normal.equals(palindrome)) { //False
		            if (Long.valueOf(normal) > pal) { //Is greater than
		                pal = Long.valueOf(normal); // pal =
		            }
		        }
		    }
		}
		System.out.println(pal);
	}
}

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