Rishabh Gupta

import java.io.*;
import java.util.*;
import static java.lang.System.*;
class myCode
{
    /*
    * @uthor for this solution : Rishabh Gupta
    */
    public static void main(String []args)throws IOException
    {
        BufferedReader br=new BufferedReader(new InputStreamReader(in));
        PrintWriter out = new PrintWriter(System.out);
        long n=Long.valueOf(br.readLine());
        n+=reverse(n);
        while(!isP(String.valueOf(n))) {
            n+=reverse(n);
        }
        out.println(n);
        out.flush();
        out.close();
    }
    static long reverse(long n) {
        long res=0;
        while(n>0) {
            res=res*10+n%10;
            n/=10;
        }
        return res;
    }
    static boolean isP(String s) {
        int l=0,r=s.length()-1;
        while(l<r) {
            if(s.charAt(l++)!=s.charAt(r--)) return false;
        }
        return true;
    }
}