import java.util.*;

public class Main{
    public static void main(String[] args){
        Scanner sc = new Scanner(System.in);

        int N = sc.nextInt();
        
        for(int i=1; i<=999; i++){
            if(N<=111*i){
                System.out.println(111 * i);
                break;
            }
        }
    }
} import java.util.*; util.* java public class Main{
    public static void main(String[] args){
        Scanner sc = new Scanner(System.in);

        int N = sc.nextInt();
        
        for(int i=1; i<=999; i++){
            if(N<=111*i){
                System.out.println(111 * i);
                break;
            }
        }
    }
} Main public static void main(String[] args){
        Scanner sc = new Scanner(System.in);

        int N = sc.nextInt();
        
        for(int i=1; i<=999; i++){
            if(N<=111*i){
                System.out.println(111 * i);
                break;
            }
        }
    } main {
        Scanner sc = new Scanner(System.in);

        int N = sc.nextInt();
        
        for(int i=1; i<=999; i++){
            if(N<=111*i){
                System.out.println(111 * i);
                break;
            }
        }
    } Scanner sc = new Scanner(System.in); sc new Scanner(System.in) int N = sc.nextInt(); N sc.nextInt() sc.nextInt sc for(int i=1; i<=999; i++){
            if(N<=111*i){
                System.out.println(111 * i);
                break;
            }
        } int i=1; int i=1; i 1 i<=999 i 999 i++ i++ i {
            if(N<=111*i){
                System.out.println(111 * i);
                break;
            }
        } {
            if(N<=111*i){
                System.out.println(111 * i);
                break;
            }
        } if(N<=111*i){
                System.out.println(111 * i);
                break;
            } N<=111*i N 111*i 111 i {
                System.out.println(111 * i);
                break;
            } System.out.println(111 * i) System.out.println System.out System System.out 111 * i 111 i break; String[] args args public class Main{
    public static void main(String[] args){
        Scanner sc = new Scanner(System.in);

        int N = sc.nextInt();
        
        for(int i=1; i<=999; i++){
            if(N<=111*i){
                System.out.println(111 * i);
                break;
            }
        }
    }
} public class Main{
    public static void main(String[] args){
        Scanner sc = new Scanner(System.in);

        int N = sc.nextInt();
        
        for(int i=1; i<=999; i++){
            if(N<=111*i){
                System.out.println(111 * i);
                break;
            }
        }
    }
} Main
import java.util.*;

public class Main{
    public static void main(String[] args){
        Scanner sc = new Scanner(System.in);

        int N = sc.nextInt();
        
        for(int i=1; i<=999; i++){
            if(N<=111*i){
                System.out.println(111 * i);
                break;
            }
        }
    }
}