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<112)
			System.out.println(111);
		else if (N<223)
			System.out.println(222);
		else if (N<334)
			System.out.println(333);
		else if (N<445)
			System.out.println(444);
		else if (N<556)
			System.out.println(555);
		else if (N<667)
			System.out.println(666);
		else if (N<778)
			System.out.println(777);
		else if (N<889)
			System.out.println(888);
		else 
			System.out.println(999);
		sc.close();

	}

} 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<112)
			System.out.println(111);
		else if (N<223)
			System.out.println(222);
		else if (N<334)
			System.out.println(333);
		else if (N<445)
			System.out.println(444);
		else if (N<556)
			System.out.println(555);
		else if (N<667)
			System.out.println(666);
		else if (N<778)
			System.out.println(777);
		else if (N<889)
			System.out.println(888);
		else 
			System.out.println(999);
		sc.close();

	}

} Main public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		int N = sc.nextInt();

		if (N<112)
			System.out.println(111);
		else if (N<223)
			System.out.println(222);
		else if (N<334)
			System.out.println(333);
		else if (N<445)
			System.out.println(444);
		else if (N<556)
			System.out.println(555);
		else if (N<667)
			System.out.println(666);
		else if (N<778)
			System.out.println(777);
		else if (N<889)
			System.out.println(888);
		else 
			System.out.println(999);
		sc.close();

	} main {
		Scanner sc = new Scanner(System.in);
		int N = sc.nextInt();

		if (N<112)
			System.out.println(111);
		else if (N<223)
			System.out.println(222);
		else if (N<334)
			System.out.println(333);
		else if (N<445)
			System.out.println(444);
		else if (N<556)
			System.out.println(555);
		else if (N<667)
			System.out.println(666);
		else if (N<778)
			System.out.println(777);
		else if (N<889)
			System.out.println(888);
		else 
			System.out.println(999);
		sc.close();

	} Scanner sc = new Scanner(System.in); sc new Scanner(System.in) int N = sc.nextInt(); N sc.nextInt() sc.nextInt sc if (N<112)
			System.out.println(111);
		else if (N<223)
			System.out.println(222);
		else if (N<334)
			System.out.println(333);
		else if (N<445)
			System.out.println(444);
		else if (N<556)
			System.out.println(555);
		else if (N<667)
			System.out.println(666);
		else if (N<778)
			System.out.println(777);
		else if (N<889)
			System.out.println(888);
		else 
			System.out.println(999); N<112 N 112 System.out.println(111) System.out.println System.out System System.out 111 if (N<223)
			System.out.println(222);
		else if (N<334)
			System.out.println(333);
		else if (N<445)
			System.out.println(444);
		else if (N<556)
			System.out.println(555);
		else if (N<667)
			System.out.println(666);
		else if (N<778)
			System.out.println(777);
		else if (N<889)
			System.out.println(888);
		else 
			System.out.println(999); N<223 N 223 System.out.println(222) System.out.println System.out System System.out 222 if (N<334)
			System.out.println(333);
		else if (N<445)
			System.out.println(444);
		else if (N<556)
			System.out.println(555);
		else if (N<667)
			System.out.println(666);
		else if (N<778)
			System.out.println(777);
		else if (N<889)
			System.out.println(888);
		else 
			System.out.println(999); N<334 N 334 System.out.println(333) System.out.println System.out System System.out 333 if (N<445)
			System.out.println(444);
		else if (N<556)
			System.out.println(555);
		else if (N<667)
			System.out.println(666);
		else if (N<778)
			System.out.println(777);
		else if (N<889)
			System.out.println(888);
		else 
			System.out.println(999); N<445 N 445 System.out.println(444) System.out.println System.out System System.out 444 if (N<556)
			System.out.println(555);
		else if (N<667)
			System.out.println(666);
		else if (N<778)
			System.out.println(777);
		else if (N<889)
			System.out.println(888);
		else 
			System.out.println(999); N<556 N 556 System.out.println(555) System.out.println System.out System System.out 555 if (N<667)
			System.out.println(666);
		else if (N<778)
			System.out.println(777);
		else if (N<889)
			System.out.println(888);
		else 
			System.out.println(999); N<667 N 667 System.out.println(666) System.out.println System.out System System.out 666 if (N<778)
			System.out.println(777);
		else if (N<889)
			System.out.println(888);
		else 
			System.out.println(999); N<778 N 778 System.out.println(777) System.out.println System.out System System.out 777 if (N<889)
			System.out.println(888);
		else 
			System.out.println(999); N<889 N 889 System.out.println(888) System.out.println System.out System System.out 888 System.out.println(999) System.out.println System.out System System.out 999 sc.close() sc.close sc String[] args args public class Main {

	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		int N = sc.nextInt();

		if (N<112)
			System.out.println(111);
		else if (N<223)
			System.out.println(222);
		else if (N<334)
			System.out.println(333);
		else if (N<445)
			System.out.println(444);
		else if (N<556)
			System.out.println(555);
		else if (N<667)
			System.out.println(666);
		else if (N<778)
			System.out.println(777);
		else if (N<889)
			System.out.println(888);
		else 
			System.out.println(999);
		sc.close();

	}

} public class Main {

	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		int N = sc.nextInt();

		if (N<112)
			System.out.println(111);
		else if (N<223)
			System.out.println(222);
		else if (N<334)
			System.out.println(333);
		else if (N<445)
			System.out.println(444);
		else if (N<556)
			System.out.println(555);
		else if (N<667)
			System.out.println(666);
		else if (N<778)
			System.out.println(777);
		else if (N<889)
			System.out.println(888);
		else 
			System.out.println(999);
		sc.close();

	}

} 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<112)
			System.out.println(111);
		else if (N<223)
			System.out.println(222);
		else if (N<334)
			System.out.println(333);
		else if (N<445)
			System.out.println(444);
		else if (N<556)
			System.out.println(555);
		else if (N<667)
			System.out.println(666);
		else if (N<778)
			System.out.println(777);
		else if (N<889)
			System.out.println(888);
		else 
			System.out.println(999);
		sc.close();

	}

}