import java.util.*;
import java.math.*;
class Main {
  public static void main(String[] args) {
    Scanner sc = new Scanner(System.in);
    int N = sc.nextInt();
    int temp = 0;
    //int[] arr = {111,222,333,444,555,666,777,888,999};
    if(N<=111) System.out.println("111");
    if(N>111 && N<=222) System.out.println("222");
    if(N>222 && N<=333) System.out.println("333");
    if(N>333 && N<=444) System.out.println("444");
    if(N>444 && N<=555) System.out.println("555");
    if(N>555 && N<=666) System.out.println("666");
    if(N>666 && N<=777) System.out.println("777");
    if(N>777 && N<=888) System.out.println("888");
    if(N>888 && N<=999) System.out.println("999");
    
    }
  } import java.util.*; util.* java import java.math.*; math.* java class Main {
  public static void main(String[] args) {
    Scanner sc = new Scanner(System.in);
    int N = sc.nextInt();
    int temp = 0;
    //int[] arr = {111,222,333,444,555,666,777,888,999};
    if(N<=111) System.out.println("111");
    if(N>111 && N<=222) System.out.println("222");
    if(N>222 && N<=333) System.out.println("333");
    if(N>333 && N<=444) System.out.println("444");
    if(N>444 && N<=555) System.out.println("555");
    if(N>555 && N<=666) System.out.println("666");
    if(N>666 && N<=777) System.out.println("777");
    if(N>777 && N<=888) System.out.println("888");
    if(N>888 && N<=999) System.out.println("999");
    
    }
  } Main public static void main(String[] args) {
    Scanner sc = new Scanner(System.in);
    int N = sc.nextInt();
    int temp = 0;
    //int[] arr = {111,222,333,444,555,666,777,888,999};
    if(N<=111) System.out.println("111");
    if(N>111 && N<=222) System.out.println("222");
    if(N>222 && N<=333) System.out.println("333");
    if(N>333 && N<=444) System.out.println("444");
    if(N>444 && N<=555) System.out.println("555");
    if(N>555 && N<=666) System.out.println("666");
    if(N>666 && N<=777) System.out.println("777");
    if(N>777 && N<=888) System.out.println("888");
    if(N>888 && N<=999) System.out.println("999");
    
    } main {
    Scanner sc = new Scanner(System.in);
    int N = sc.nextInt();
    int temp = 0;
    //int[] arr = {111,222,333,444,555,666,777,888,999};
    if(N<=111) System.out.println("111");
    if(N>111 && N<=222) System.out.println("222");
    if(N>222 && N<=333) System.out.println("333");
    if(N>333 && N<=444) System.out.println("444");
    if(N>444 && N<=555) System.out.println("555");
    if(N>555 && N<=666) System.out.println("666");
    if(N>666 && N<=777) System.out.println("777");
    if(N>777 && N<=888) System.out.println("888");
    if(N>888 && N<=999) 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 int temp = 0; temp 0 if(N<=111) System.out.println("111"); N<=111 N 111 System.out.println("111") System.out.println System.out System System.out "111" if(N>111 && N<=222) System.out.println("222"); N>111 && N<=222 N>111 N 111 N<=222 N 222 System.out.println("222") System.out.println System.out System System.out "222" if(N>222 && N<=333) System.out.println("333"); N>222 && N<=333 N>222 N 222 N<=333 N 333 System.out.println("333") System.out.println System.out System System.out "333" if(N>333 && N<=444) System.out.println("444"); N>333 && N<=444 N>333 N 333 N<=444 N 444 System.out.println("444") System.out.println System.out System System.out "444" if(N>444 && N<=555) System.out.println("555"); N>444 && N<=555 N>444 N 444 N<=555 N 555 System.out.println("555") System.out.println System.out System System.out "555" if(N>555 && N<=666) System.out.println("666"); N>555 && N<=666 N>555 N 555 N<=666 N 666 System.out.println("666") System.out.println System.out System System.out "666" if(N>666 && N<=777) System.out.println("777"); N>666 && N<=777 N>666 N 666 N<=777 N 777 System.out.println("777") System.out.println System.out System System.out "777" if(N>777 && N<=888) System.out.println("888"); N>777 && N<=888 N>777 N 777 N<=888 N 888 System.out.println("888") System.out.println System.out System System.out "888" if(N>888 && N<=999) System.out.println("999"); N>888 && N<=999 N>888 N 888 N<=999 N 999 System.out.println("999") System.out.println System.out System System.out "999" String[] args args
import java.util.*;
import java.math.*;
class Main {
  public static void main(String[] args) {
    Scanner sc = new Scanner(System.in);
    int N = sc.nextInt();
    int temp = 0;
    //int[] arr = {111,222,333,444,555,666,777,888,999};
    if(N<=111) System.out.println("111");
    if(N>111 && N<=222) System.out.println("222");
    if(N>222 && N<=333) System.out.println("333");
    if(N>333 && N<=444) System.out.println("444");
    if(N>444 && N<=555) System.out.println("555");
    if(N>555 && N<=666) System.out.println("666");
    if(N>666 && N<=777) System.out.println("777");
    if(N>777 && N<=888) System.out.println("888");
    if(N>888 && N<=999) System.out.println("999");
    
    }
  }
