import java.util.Scanner;

public class Main {
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		int N=sc.nextInt();
		System.out.println(N%111==0?N:N+111-(N%111));
	}
} 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();
		System.out.println(N%111==0?N:N+111-(N%111));
	}
} Main public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		int N=sc.nextInt();
		System.out.println(N%111==0?N:N+111-(N%111));
	} main {
		Scanner sc = new Scanner(System.in);
		int N=sc.nextInt();
		System.out.println(N%111==0?N:N+111-(N%111));
	} Scanner sc = new Scanner(System.in); sc new Scanner(System.in) int N=sc.nextInt(); N sc.nextInt() sc.nextInt sc System.out.println(N%111==0?N:N+111-(N%111)) System.out.println System.out System System.out N%111==0?N:N+111-(N%111) N%111==0 N%111 N 111 0 N N+111-(N%111) N+111 N 111 (N%111) N 111 String[] args args public class Main {
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		int N=sc.nextInt();
		System.out.println(N%111==0?N:N+111-(N%111));
	}
} public class Main {
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		int N=sc.nextInt();
		System.out.println(N%111==0?N:N+111-(N%111));
	}
} Main
import java.util.Scanner;

public class Main {
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		int N=sc.nextInt();
		System.out.println(N%111==0?N:N+111-(N%111));
	}
}
