import java.util.*;

class Main{
  public static void main(String args[]){
    Scanner sc = new Scanner(System.in);
    int n = sc.nextInt();
    System.out.print(n%111==0?n:((n/111)+1)*111);
  }
} import java.util.*; util.* java class Main{
  public static void main(String args[]){
    Scanner sc = new Scanner(System.in);
    int n = sc.nextInt();
    System.out.print(n%111==0?n:((n/111)+1)*111);
  }
} Main public static void main(String args[]){
    Scanner sc = new Scanner(System.in);
    int n = sc.nextInt();
    System.out.print(n%111==0?n:((n/111)+1)*111);
  } main {
    Scanner sc = new Scanner(System.in);
    int n = sc.nextInt();
    System.out.print(n%111==0?n:((n/111)+1)*111);
  } Scanner sc = new Scanner(System.in); sc new Scanner(System.in) int n = sc.nextInt(); n sc.nextInt() sc.nextInt sc System.out.print(n%111==0?n:((n/111)+1)*111) System.out.print System.out System System.out n%111==0?n:((n/111)+1)*111 n%111==0 n%111 n 111 0 n ((n/111)+1)*111 ((n/111)+1) (n/111) n 111 1 111 String args[] args
import java.util.*;

class Main{
  public static void main(String args[]){
    Scanner sc = new Scanner(System.in);
    int n = sc.nextInt();
    System.out.print(n%111==0?n:((n/111)+1)*111);
  }
}
