CCC '13 S1 - From 1987 to 2013

//Ivan Li, Markville secondary school
import java.io.*;
import java.util.*;

public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        int year = sc.nextInt()+1;
        while(true){
           
            char A[] = Integer.toString(year).toCharArray();
            boolean distinct = false;
            Arrays.sort(A);
            for(int i=0; i<A.length-1; i++){
                if(A[i]==A[i+1]){

                    distinct = true;
                }
            }
            if(distinct==false){
                System.out.println(year);
                return;
            }
            else{
                year++;
            }
        }




            
        

    }
}