import java.util.Scanner;

public class Main {

	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		int N = sc.nextInt();
		int a = 0;
		for(int i=N; i<1000; i++) {
			if(i%111==0) {
				a = i;
				break;
			}
		}
		sc.close();
		System.out.println(a);
	}

} 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();
		int a = 0;
		for(int i=N; i<1000; i++) {
			if(i%111==0) {
				a = i;
				break;
			}
		}
		sc.close();
		System.out.println(a);
	}

} Main public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		int N = sc.nextInt();
		int a = 0;
		for(int i=N; i<1000; i++) {
			if(i%111==0) {
				a = i;
				break;
			}
		}
		sc.close();
		System.out.println(a);
	} main {
		Scanner sc = new Scanner(System.in);
		int N = sc.nextInt();
		int a = 0;
		for(int i=N; i<1000; i++) {
			if(i%111==0) {
				a = i;
				break;
			}
		}
		sc.close();
		System.out.println(a);
	} Scanner sc = new Scanner(System.in); sc new Scanner(System.in) int N = sc.nextInt(); N sc.nextInt() sc.nextInt sc int a = 0; a 0 for(int i=N; i<1000; i++) {
			if(i%111==0) {
				a = i;
				break;
			}
		} int i=N; int i=N; i N i<1000 i 1000 i++ i++ i {
			if(i%111==0) {
				a = i;
				break;
			}
		} {
			if(i%111==0) {
				a = i;
				break;
			}
		} if(i%111==0) {
				a = i;
				break;
			} i%111==0 i%111 i 111 0 {
				a = i;
				break;
			} a = i a i break; sc.close() sc.close sc System.out.println(a) System.out.println System.out System System.out a String[] args args public class Main {

	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		int N = sc.nextInt();
		int a = 0;
		for(int i=N; i<1000; i++) {
			if(i%111==0) {
				a = i;
				break;
			}
		}
		sc.close();
		System.out.println(a);
	}

} public class Main {

	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		int N = sc.nextInt();
		int a = 0;
		for(int i=N; i<1000; i++) {
			if(i%111==0) {
				a = i;
				break;
			}
		}
		sc.close();
		System.out.println(a);
	}

} Main
import java.util.Scanner;

public class Main {

	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		int N = sc.nextInt();
		int a = 0;
		for(int i=N; i<1000; i++) {
			if(i%111==0) {
				a = i;
				break;
			}
		}
		sc.close();
		System.out.println(a);
	}

}