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

        if(n>=100 && n<112){
            System.out.println(111);
        }else if(n>=112 && n<=222){
            System.out.println(222);
        }else if(n>222 && n<=333){
            System.out.println(333);
        }else if(n>333 && n<=444){
            System.out.println(444);
        }else if(n>444 && n<=555){
            System.out.println(555);
        }else if(n>555 && n<=666){
            System.out.println(666);
        }else if(n>666 && n<=777){
            System.out.println(777);
        }else if(n>777 && n<=888){
            System.out.println(888);
        }else if(n>888 && n<=999){
            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>=100 && n<112){
            System.out.println(111);
        }else if(n>=112 && n<=222){
            System.out.println(222);
        }else if(n>222 && n<=333){
            System.out.println(333);
        }else if(n>333 && n<=444){
            System.out.println(444);
        }else if(n>444 && n<=555){
            System.out.println(555);
        }else if(n>555 && n<=666){
            System.out.println(666);
        }else if(n>666 && n<=777){
            System.out.println(777);
        }else if(n>777 && n<=888){
            System.out.println(888);
        }else 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();

        if(n>=100 && n<112){
            System.out.println(111);
        }else if(n>=112 && n<=222){
            System.out.println(222);
        }else if(n>222 && n<=333){
            System.out.println(333);
        }else if(n>333 && n<=444){
            System.out.println(444);
        }else if(n>444 && n<=555){
            System.out.println(555);
        }else if(n>555 && n<=666){
            System.out.println(666);
        }else if(n>666 && n<=777){
            System.out.println(777);
        }else if(n>777 && n<=888){
            System.out.println(888);
        }else if(n>888 && n<=999){
            System.out.println(999);
        }
        
    } main {
        Scanner sc = new Scanner(System.in);
        int n = sc.nextInt();

        if(n>=100 && n<112){
            System.out.println(111);
        }else if(n>=112 && n<=222){
            System.out.println(222);
        }else if(n>222 && n<=333){
            System.out.println(333);
        }else if(n>333 && n<=444){
            System.out.println(444);
        }else if(n>444 && n<=555){
            System.out.println(555);
        }else if(n>555 && n<=666){
            System.out.println(666);
        }else if(n>666 && n<=777){
            System.out.println(777);
        }else if(n>777 && n<=888){
            System.out.println(888);
        }else 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 if(n>=100 && n<112){
            System.out.println(111);
        }else if(n>=112 && n<=222){
            System.out.println(222);
        }else if(n>222 && n<=333){
            System.out.println(333);
        }else if(n>333 && n<=444){
            System.out.println(444);
        }else if(n>444 && n<=555){
            System.out.println(555);
        }else if(n>555 && n<=666){
            System.out.println(666);
        }else if(n>666 && n<=777){
            System.out.println(777);
        }else if(n>777 && n<=888){
            System.out.println(888);
        }else if(n>888 && n<=999){
            System.out.println(999);
        } n>=100 && n<112 n>=100 n 100 n<112 n 112 {
            System.out.println(111);
        } System.out.println(111) System.out.println System.out System System.out 111 if(n>=112 && n<=222){
            System.out.println(222);
        }else if(n>222 && n<=333){
            System.out.println(333);
        }else if(n>333 && n<=444){
            System.out.println(444);
        }else if(n>444 && n<=555){
            System.out.println(555);
        }else if(n>555 && n<=666){
            System.out.println(666);
        }else if(n>666 && n<=777){
            System.out.println(777);
        }else if(n>777 && n<=888){
            System.out.println(888);
        }else if(n>888 && n<=999){
            System.out.println(999);
        } n>=112 && n<=222 n>=112 n 112 n<=222 n 222 {
            System.out.println(222);
        } System.out.println(222) System.out.println System.out System System.out 222 if(n>222 && n<=333){
            System.out.println(333);
        }else if(n>333 && n<=444){
            System.out.println(444);
        }else if(n>444 && n<=555){
            System.out.println(555);
        }else if(n>555 && n<=666){
            System.out.println(666);
        }else if(n>666 && n<=777){
            System.out.println(777);
        }else if(n>777 && n<=888){
            System.out.println(888);
        }else if(n>888 && n<=999){
            System.out.println(999);
        } n>222 && n<=333 n>222 n 222 n<=333 n 333 {
            System.out.println(333);
        } System.out.println(333) System.out.println System.out System System.out 333 if(n>333 && n<=444){
            System.out.println(444);
        }else if(n>444 && n<=555){
            System.out.println(555);
        }else if(n>555 && n<=666){
            System.out.println(666);
        }else if(n>666 && n<=777){
            System.out.println(777);
        }else if(n>777 && n<=888){
            System.out.println(888);
        }else if(n>888 && n<=999){
            System.out.println(999);
        } n>333 && n<=444 n>333 n 333 n<=444 n 444 {
            System.out.println(444);
        } System.out.println(444) System.out.println System.out System System.out 444 if(n>444 && n<=555){
            System.out.println(555);
        }else if(n>555 && n<=666){
            System.out.println(666);
        }else if(n>666 && n<=777){
            System.out.println(777);
        }else if(n>777 && n<=888){
            System.out.println(888);
        }else if(n>888 && n<=999){
            System.out.println(999);
        } n>444 && n<=555 n>444 n 444 n<=555 n 555 {
            System.out.println(555);
        } System.out.println(555) System.out.println System.out System System.out 555 if(n>555 && n<=666){
            System.out.println(666);
        }else if(n>666 && n<=777){
            System.out.println(777);
        }else if(n>777 && n<=888){
            System.out.println(888);
        }else if(n>888 && n<=999){
            System.out.println(999);
        } n>555 && n<=666 n>555 n 555 n<=666 n 666 {
            System.out.println(666);
        } System.out.println(666) System.out.println System.out System System.out 666 if(n>666 && n<=777){
            System.out.println(777);
        }else if(n>777 && n<=888){
            System.out.println(888);
        }else if(n>888 && n<=999){
            System.out.println(999);
        } n>666 && n<=777 n>666 n 666 n<=777 n 777 {
            System.out.println(777);
        } System.out.println(777) System.out.println System.out System System.out 777 if(n>777 && n<=888){
            System.out.println(888);
        }else if(n>888 && n<=999){
            System.out.println(999);
        } n>777 && n<=888 n>777 n 777 n<=888 n 888 {
            System.out.println(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(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>=100 && n<112){
            System.out.println(111);
        }else if(n>=112 && n<=222){
            System.out.println(222);
        }else if(n>222 && n<=333){
            System.out.println(333);
        }else if(n>333 && n<=444){
            System.out.println(444);
        }else if(n>444 && n<=555){
            System.out.println(555);
        }else if(n>555 && n<=666){
            System.out.println(666);
        }else if(n>666 && n<=777){
            System.out.println(777);
        }else if(n>777 && n<=888){
            System.out.println(888);
        }else if(n>888 && n<=999){
            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>=100 && n<112){
            System.out.println(111);
        }else if(n>=112 && n<=222){
            System.out.println(222);
        }else if(n>222 && n<=333){
            System.out.println(333);
        }else if(n>333 && n<=444){
            System.out.println(444);
        }else if(n>444 && n<=555){
            System.out.println(555);
        }else if(n>555 && n<=666){
            System.out.println(666);
        }else if(n>666 && n<=777){
            System.out.println(777);
        }else if(n>777 && n<=888){
            System.out.println(888);
        }else if(n>888 && n<=999){
            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>=100 && n<112){
            System.out.println(111);
        }else if(n>=112 && n<=222){
            System.out.println(222);
        }else if(n>222 && n<=333){
            System.out.println(333);
        }else if(n>333 && n<=444){
            System.out.println(444);
        }else if(n>444 && n<=555){
            System.out.println(555);
        }else if(n>555 && n<=666){
            System.out.println(666);
        }else if(n>666 && n<=777){
            System.out.println(777);
        }else if(n>777 && n<=888){
            System.out.println(888);
        }else if(n>888 && n<=999){
            System.out.println(999);
        }
        
    }
}
