import java.util.Scanner;

public class Main {

    public static void main(String args[]) {

        Scanner sc = new Scanner(System.in);
        int n = Integer.parseInt(sc.next());

        int result = 0;
        for (int i = 111; i <= 999 && result == 0; i += 111) {
            if (n <= i) {
                result = i;
            }
        }

        System.out.println(result);
    }
} import java.util.Scanner; Scanner java.util public class Main {

    public static void main(String args[]) {

        Scanner sc = new Scanner(System.in);
        int n = Integer.parseInt(sc.next());

        int result = 0;
        for (int i = 111; i <= 999 && result == 0; i += 111) {
            if (n <= i) {
                result = i;
            }
        }

        System.out.println(result);
    }
} Main public static void main(String args[]) {

        Scanner sc = new Scanner(System.in);
        int n = Integer.parseInt(sc.next());

        int result = 0;
        for (int i = 111; i <= 999 && result == 0; i += 111) {
            if (n <= i) {
                result = i;
            }
        }

        System.out.println(result);
    } main {

        Scanner sc = new Scanner(System.in);
        int n = Integer.parseInt(sc.next());

        int result = 0;
        for (int i = 111; i <= 999 && result == 0; i += 111) {
            if (n <= i) {
                result = i;
            }
        }

        System.out.println(result);
    } Scanner sc = new Scanner(System.in); sc new Scanner(System.in) int n = Integer.parseInt(sc.next()); n Integer.parseInt(sc.next()) Integer.parseInt Integer sc.next() sc.next sc int result = 0; result 0 for (int i = 111; i <= 999 && result == 0; i += 111) {
            if (n <= i) {
                result = i;
            }
        } int i = 111; int i = 111; i 111 i <= 999 && result == 0 i <= 999 i 999 result == 0 result 0 i += 111 i += 111 i 111 {
            if (n <= i) {
                result = i;
            }
        } {
            if (n <= i) {
                result = i;
            }
        } if (n <= i) {
                result = i;
            } n <= i n i {
                result = i;
            } result = i result i System.out.println(result) System.out.println System.out System System.out result String args[] args public class Main {

    public static void main(String args[]) {

        Scanner sc = new Scanner(System.in);
        int n = Integer.parseInt(sc.next());

        int result = 0;
        for (int i = 111; i <= 999 && result == 0; i += 111) {
            if (n <= i) {
                result = i;
            }
        }

        System.out.println(result);
    }
} public class Main {

    public static void main(String args[]) {

        Scanner sc = new Scanner(System.in);
        int n = Integer.parseInt(sc.next());

        int result = 0;
        for (int i = 111; i <= 999 && result == 0; i += 111) {
            if (n <= i) {
                result = i;
            }
        }

        System.out.println(result);
    }
} Main
import java.util.Scanner;

public class Main {

    public static void main(String args[]) {

        Scanner sc = new Scanner(System.in);
        int n = Integer.parseInt(sc.next());

        int result = 0;
        for (int i = 111; i <= 999 && result == 0; i += 111) {
            if (n <= i) {
                result = i;
            }
        }

        System.out.println(result);
    }
}