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(112<=N && N<=222){
    System.out.println("222");
    }else if(223<=N && N<=333){
    System.out.println("333");
    }else if(334<=N && N<=444){
    System.out.println("444");
    }else if(445<=N && N<=555){
    System.out.println("555");
    }else if(556<=N && N<=666){
    System.out.println("666");
    }else if(667<=N && N<=777){
    System.out.println("777");
    }else if(778<=N && 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(112<=N && N<=222){
    System.out.println("222");
    }else if(223<=N && N<=333){
    System.out.println("333");
    }else if(334<=N && N<=444){
    System.out.println("444");
    }else if(445<=N && N<=555){
    System.out.println("555");
    }else if(556<=N && N<=666){
    System.out.println("666");
    }else if(667<=N && N<=777){
    System.out.println("777");
    }else if(778<=N && 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(112<=N && N<=222){
    System.out.println("222");
    }else if(223<=N && N<=333){
    System.out.println("333");
    }else if(334<=N && N<=444){
    System.out.println("444");
    }else if(445<=N && N<=555){
    System.out.println("555");
    }else if(556<=N && N<=666){
    System.out.println("666");
    }else if(667<=N && N<=777){
    System.out.println("777");
    }else if(778<=N && 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(112<=N && N<=222){
    System.out.println("222");
    }else if(223<=N && N<=333){
    System.out.println("333");
    }else if(334<=N && N<=444){
    System.out.println("444");
    }else if(445<=N && N<=555){
    System.out.println("555");
    }else if(556<=N && N<=666){
    System.out.println("666");
    }else if(667<=N && N<=777){
    System.out.println("777");
    }else if(778<=N && 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(112<=N && N<=222){
    System.out.println("222");
    }else if(223<=N && N<=333){
    System.out.println("333");
    }else if(334<=N && N<=444){
    System.out.println("444");
    }else if(445<=N && N<=555){
    System.out.println("555");
    }else if(556<=N && N<=666){
    System.out.println("666");
    }else if(667<=N && N<=777){
    System.out.println("777");
    }else if(778<=N && 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(112<=N && N<=222){
    System.out.println("222");
    }else if(223<=N && N<=333){
    System.out.println("333");
    }else if(334<=N && N<=444){
    System.out.println("444");
    }else if(445<=N && N<=555){
    System.out.println("555");
    }else if(556<=N && N<=666){
    System.out.println("666");
    }else if(667<=N && N<=777){
    System.out.println("777");
    }else if(778<=N && N<=888){
    System.out.println("888");
    }else{
    System.out.println("999");   
        } 112<=N && N<=222 112<=N 112 N N<=222 N 222 {
    System.out.println("222");
    } System.out.println("222") System.out.println System.out System System.out "222" if(223<=N && N<=333){
    System.out.println("333");
    }else if(334<=N && N<=444){
    System.out.println("444");
    }else if(445<=N && N<=555){
    System.out.println("555");
    }else if(556<=N && N<=666){
    System.out.println("666");
    }else if(667<=N && N<=777){
    System.out.println("777");
    }else if(778<=N && N<=888){
    System.out.println("888");
    }else{
    System.out.println("999");   
        } 223<=N && N<=333 223<=N 223 N N<=333 N 333 {
    System.out.println("333");
    } System.out.println("333") System.out.println System.out System System.out "333" if(334<=N && N<=444){
    System.out.println("444");
    }else if(445<=N && N<=555){
    System.out.println("555");
    }else if(556<=N && N<=666){
    System.out.println("666");
    }else if(667<=N && N<=777){
    System.out.println("777");
    }else if(778<=N && N<=888){
    System.out.println("888");
    }else{
    System.out.println("999");   
        } 334<=N && N<=444 334<=N 334 N N<=444 N 444 {
    System.out.println("444");
    } System.out.println("444") System.out.println System.out System System.out "444" if(445<=N && N<=555){
    System.out.println("555");
    }else if(556<=N && N<=666){
    System.out.println("666");
    }else if(667<=N && N<=777){
    System.out.println("777");
    }else if(778<=N && N<=888){
    System.out.println("888");
    }else{
    System.out.println("999");   
        } 445<=N && N<=555 445<=N 445 N N<=555 N 555 {
    System.out.println("555");
    } System.out.println("555") System.out.println System.out System System.out "555" if(556<=N && N<=666){
    System.out.println("666");
    }else if(667<=N && N<=777){
    System.out.println("777");
    }else if(778<=N && N<=888){
    System.out.println("888");
    }else{
    System.out.println("999");   
        } 556<=N && N<=666 556<=N 556 N N<=666 N 666 {
    System.out.println("666");
    } System.out.println("666") System.out.println System.out System System.out "666" if(667<=N && N<=777){
    System.out.println("777");
    }else if(778<=N && N<=888){
    System.out.println("888");
    }else{
    System.out.println("999");   
        } 667<=N && N<=777 667<=N 667 N N<=777 N 777 {
    System.out.println("777");
    } System.out.println("777") System.out.println System.out System System.out "777" if(778<=N && N<=888){
    System.out.println("888");
    }else{
    System.out.println("999");   
        } 778<=N && N<=888 778<=N 778 N 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(112<=N && N<=222){
    System.out.println("222");
    }else if(223<=N && N<=333){
    System.out.println("333");
    }else if(334<=N && N<=444){
    System.out.println("444");
    }else if(445<=N && N<=555){
    System.out.println("555");
    }else if(556<=N && N<=666){
    System.out.println("666");
    }else if(667<=N && N<=777){
    System.out.println("777");
    }else if(778<=N && 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(112<=N && N<=222){
    System.out.println("222");
    }else if(223<=N && N<=333){
    System.out.println("333");
    }else if(334<=N && N<=444){
    System.out.println("444");
    }else if(445<=N && N<=555){
    System.out.println("555");
    }else if(556<=N && N<=666){
    System.out.println("666");
    }else if(667<=N && N<=777){
    System.out.println("777");
    }else if(778<=N && 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(112<=N && N<=222){
    System.out.println("222");
    }else if(223<=N && N<=333){
    System.out.println("333");
    }else if(334<=N && N<=444){
    System.out.println("444");
    }else if(445<=N && N<=555){
    System.out.println("555");
    }else if(556<=N && N<=666){
    System.out.println("666");
    }else if(667<=N && N<=777){
    System.out.println("777");
    }else if(778<=N && N<=888){
    System.out.println("888");
    }else{
    System.out.println("999");   
        }
    }
}