import java.util.Scanner;

class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        int N = sc.nextInt();
        sc.close();
        for (int i = 0; i <= 9; ++i) {
            if (N <= 111 * i) {
                System.out.print(111 * i);
                break;
            }
        }
    }
} import java.util.Scanner; Scanner java.util class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        int N = sc.nextInt();
        sc.close();
        for (int i = 0; i <= 9; ++i) {
            if (N <= 111 * i) {
                System.out.print(111 * i);
                break;
            }
        }
    }
} Main public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        int N = sc.nextInt();
        sc.close();
        for (int i = 0; i <= 9; ++i) {
            if (N <= 111 * i) {
                System.out.print(111 * i);
                break;
            }
        }
    } main {
        Scanner sc = new Scanner(System.in);
        int N = sc.nextInt();
        sc.close();
        for (int i = 0; i <= 9; ++i) {
            if (N <= 111 * i) {
                System.out.print(111 * i);
                break;
            }
        }
    } Scanner sc = new Scanner(System.in); sc new Scanner(System.in) int N = sc.nextInt(); N sc.nextInt() sc.nextInt sc sc.close() sc.close sc for (int i = 0; i <= 9; ++i) {
            if (N <= 111 * i) {
                System.out.print(111 * i);
                break;
            }
        } int i = 0; int i = 0; i 0 i <= 9 i 9 ++i ++i i {
            if (N <= 111 * i) {
                System.out.print(111 * i);
                break;
            }
        } {
            if (N <= 111 * i) {
                System.out.print(111 * i);
                break;
            }
        } if (N <= 111 * i) {
                System.out.print(111 * i);
                break;
            } N <= 111 * i N 111 * i 111 i {
                System.out.print(111 * i);
                break;
            } System.out.print(111 * i) System.out.print System.out System System.out 111 * i 111 i break; String[] args args
import java.util.Scanner;

class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        int N = sc.nextInt();
        sc.close();
        for (int i = 0; i <= 9; ++i) {
            if (N <= 111 * i) {
                System.out.print(111 * i);
                break;
            }
        }
    }
}