import java.util.*;

public class Main{
      public static void main(String[] args) {
            Scanner sc = new Scanner(System.in);
            int N = sc.nextInt();
            if(N <= 111){
              System.out.println(111);
            } else if(N <= 222){
              System.out.println(222);
            } else if(N <= 333){
              System.out.println(333);
            } else if(N <= 444){
              System.out.println(444);
            } else if(N <= 555){
              System.out.println(555);
            } else if(N <= 666){
              System.out.println(666);
            } else if(N <= 777){
              System.out.println(777);
            } else if(N <= 888){
              System.out.println(888);
            } else {
              System.out.println(999);
            }
          }
} import java.util.*; util.* java public class Main{
      public static void main(String[] args) {
            Scanner sc = new Scanner(System.in);
            int N = sc.nextInt();
            if(N <= 111){
              System.out.println(111);
            } else if(N <= 222){
              System.out.println(222);
            } else if(N <= 333){
              System.out.println(333);
            } else if(N <= 444){
              System.out.println(444);
            } else if(N <= 555){
              System.out.println(555);
            } else if(N <= 666){
              System.out.println(666);
            } else if(N <= 777){
              System.out.println(777);
            } else if(N <= 888){
              System.out.println(888);
            } else {
              System.out.println(999);
            }
          }
} Main public static void main(String[] args) {
            Scanner sc = new Scanner(System.in);
            int N = sc.nextInt();
            if(N <= 111){
              System.out.println(111);
            } else if(N <= 222){
              System.out.println(222);
            } else if(N <= 333){
              System.out.println(333);
            } else if(N <= 444){
              System.out.println(444);
            } else if(N <= 555){
              System.out.println(555);
            } else if(N <= 666){
              System.out.println(666);
            } else if(N <= 777){
              System.out.println(777);
            } else if(N <= 888){
              System.out.println(888);
            } else {
              System.out.println(999);
            }
          } main {
            Scanner sc = new Scanner(System.in);
            int N = sc.nextInt();
            if(N <= 111){
              System.out.println(111);
            } else if(N <= 222){
              System.out.println(222);
            } else if(N <= 333){
              System.out.println(333);
            } else if(N <= 444){
              System.out.println(444);
            } else if(N <= 555){
              System.out.println(555);
            } else if(N <= 666){
              System.out.println(666);
            } else if(N <= 777){
              System.out.println(777);
            } else if(N <= 888){
              System.out.println(888);
            } else {
              System.out.println(999);
            }
          } Scanner sc = new Scanner(System.in); sc new Scanner(System.in) int N = sc.nextInt(); N sc.nextInt() sc.nextInt sc if(N <= 111){
              System.out.println(111);
            } else if(N <= 222){
              System.out.println(222);
            } else if(N <= 333){
              System.out.println(333);
            } else if(N <= 444){
              System.out.println(444);
            } else if(N <= 555){
              System.out.println(555);
            } else if(N <= 666){
              System.out.println(666);
            } else if(N <= 777){
              System.out.println(777);
            } else if(N <= 888){
              System.out.println(888);
            } else {
              System.out.println(999);
            } N <= 111 N 111 {
              System.out.println(111);
            } System.out.println(111) System.out.println System.out System System.out 111 if(N <= 222){
              System.out.println(222);
            } else if(N <= 333){
              System.out.println(333);
            } else if(N <= 444){
              System.out.println(444);
            } else if(N <= 555){
              System.out.println(555);
            } else if(N <= 666){
              System.out.println(666);
            } else if(N <= 777){
              System.out.println(777);
            } else if(N <= 888){
              System.out.println(888);
            } else {
              System.out.println(999);
            } N <= 222 N 222 {
              System.out.println(222);
            } System.out.println(222) System.out.println System.out System System.out 222 if(N <= 333){
              System.out.println(333);
            } else if(N <= 444){
              System.out.println(444);
            } else if(N <= 555){
              System.out.println(555);
            } else if(N <= 666){
              System.out.println(666);
            } else if(N <= 777){
              System.out.println(777);
            } else if(N <= 888){
              System.out.println(888);
            } else {
              System.out.println(999);
            } N <= 333 N 333 {
              System.out.println(333);
            } System.out.println(333) System.out.println System.out System System.out 333 if(N <= 444){
              System.out.println(444);
            } else if(N <= 555){
              System.out.println(555);
            } else if(N <= 666){
              System.out.println(666);
            } else if(N <= 777){
              System.out.println(777);
            } else if(N <= 888){
              System.out.println(888);
            } else {
              System.out.println(999);
            } N <= 444 N 444 {
              System.out.println(444);
            } System.out.println(444) System.out.println System.out System System.out 444 if(N <= 555){
              System.out.println(555);
            } else if(N <= 666){
              System.out.println(666);
            } else if(N <= 777){
              System.out.println(777);
            } else if(N <= 888){
              System.out.println(888);
            } else {
              System.out.println(999);
            } N <= 555 N 555 {
              System.out.println(555);
            } System.out.println(555) System.out.println System.out System System.out 555 if(N <= 666){
              System.out.println(666);
            } else if(N <= 777){
              System.out.println(777);
            } else if(N <= 888){
              System.out.println(888);
            } else {
              System.out.println(999);
            } N <= 666 N 666 {
              System.out.println(666);
            } System.out.println(666) System.out.println System.out System System.out 666 if(N <= 777){
              System.out.println(777);
            } else if(N <= 888){
              System.out.println(888);
            } else {
              System.out.println(999);
            } N <= 777 N 777 {
              System.out.println(777);
            } System.out.println(777) System.out.println System.out System System.out 777 if(N <= 888){
              System.out.println(888);
            } else {
              System.out.println(999);
            } N <= 888 N 888 {
              System.out.println(888);
            } System.out.println(888) System.out.println System.out System System.out 888 {
              System.out.println(999);
            } System.out.println(999) System.out.println System.out System System.out 999 String[] args args public class Main{
      public static void main(String[] args) {
            Scanner sc = new Scanner(System.in);
            int N = sc.nextInt();
            if(N <= 111){
              System.out.println(111);
            } else if(N <= 222){
              System.out.println(222);
            } else if(N <= 333){
              System.out.println(333);
            } else if(N <= 444){
              System.out.println(444);
            } else if(N <= 555){
              System.out.println(555);
            } else if(N <= 666){
              System.out.println(666);
            } else if(N <= 777){
              System.out.println(777);
            } else if(N <= 888){
              System.out.println(888);
            } else {
              System.out.println(999);
            }
          }
} public class Main{
      public static void main(String[] args) {
            Scanner sc = new Scanner(System.in);
            int N = sc.nextInt();
            if(N <= 111){
              System.out.println(111);
            } else if(N <= 222){
              System.out.println(222);
            } else if(N <= 333){
              System.out.println(333);
            } else if(N <= 444){
              System.out.println(444);
            } else if(N <= 555){
              System.out.println(555);
            } else if(N <= 666){
              System.out.println(666);
            } else if(N <= 777){
              System.out.println(777);
            } else if(N <= 888){
              System.out.println(888);
            } else {
              System.out.println(999);
            }
          }
} Main
import java.util.*;

public class Main{
      public static void main(String[] args) {
            Scanner sc = new Scanner(System.in);
            int N = sc.nextInt();
            if(N <= 111){
              System.out.println(111);
            } else if(N <= 222){
              System.out.println(222);
            } else if(N <= 333){
              System.out.println(333);
            } else if(N <= 444){
              System.out.println(444);
            } else if(N <= 555){
              System.out.println(555);
            } else if(N <= 666){
              System.out.println(666);
            } else if(N <= 777){
              System.out.println(777);
            } else if(N <= 888){
              System.out.println(888);
            } else {
              System.out.println(999);
            }
          }
}