import java.util.Scanner;
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.Scanner; Scanner 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");
    }
    }
} 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.Scanner;
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");
    }
    }
}