import java.util.Scanner;

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

	while(n%111!=0){
		n++;
	}
	System.out.println(n);
	}} import java.util.Scanner; Scanner java.util public class Main {
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
	int n=sc.nextInt();

	while(n%111!=0){
		n++;
	}
	System.out.println(n);
	}} Main public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
	int n=sc.nextInt();

	while(n%111!=0){
		n++;
	}
	System.out.println(n);
	} main {
		Scanner sc = new Scanner(System.in);
	int n=sc.nextInt();

	while(n%111!=0){
		n++;
	}
	System.out.println(n);
	} Scanner sc = new Scanner(System.in); sc new Scanner(System.in) int n=sc.nextInt(); n sc.nextInt() sc.nextInt sc while(n%111!=0){
		n++;
	} n%111!=0 n%111 n 111 0 {
		n++;
	} n++ n System.out.println(n) System.out.println System.out System System.out n String[] args args public class Main {
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
	int n=sc.nextInt();

	while(n%111!=0){
		n++;
	}
	System.out.println(n);
	}} public class Main {
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
	int n=sc.nextInt();

	while(n%111!=0){
		n++;
	}
	System.out.println(n);
	}} Main
import java.util.Scanner;

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

	while(n%111!=0){
		n++;
	}
	System.out.println(n);
	}}