import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        int N = sc.nextInt();
        int res = 0;
        for (int i = 111; i <= 999; i += 111) {
            if (i >= N) {
                res = i;
                break;
            }
        }
        System.out.println(res);
        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();
        int res = 0;
        for (int i = 111; i <= 999; i += 111) {
            if (i >= N) {
                res = i;
                break;
            }
        }
        System.out.println(res);
        sc.close();
    }
} Main public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        int N = sc.nextInt();
        int res = 0;
        for (int i = 111; i <= 999; i += 111) {
            if (i >= N) {
                res = i;
                break;
            }
        }
        System.out.println(res);
        sc.close();
    } main {
        Scanner sc = new Scanner(System.in);
        int N = sc.nextInt();
        int res = 0;
        for (int i = 111; i <= 999; i += 111) {
            if (i >= N) {
                res = i;
                break;
            }
        }
        System.out.println(res);
        sc.close();
    } Scanner sc = new Scanner(System.in); sc new Scanner(System.in) int N = sc.nextInt(); N sc.nextInt() sc.nextInt sc int res = 0; res 0 for (int i = 111; i <= 999; i += 111) {
            if (i >= N) {
                res = i;
                break;
            }
        } int i = 111; int i = 111; i 111 i <= 999 i 999 i += 111 i += 111 i 111 {
            if (i >= N) {
                res = i;
                break;
            }
        } {
            if (i >= N) {
                res = i;
                break;
            }
        } if (i >= N) {
                res = i;
                break;
            } i >= N i N {
                res = i;
                break;
            } res = i res i break; System.out.println(res) System.out.println System.out System System.out res 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();
        int res = 0;
        for (int i = 111; i <= 999; i += 111) {
            if (i >= N) {
                res = i;
                break;
            }
        }
        System.out.println(res);
        sc.close();
    }
} public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        int N = sc.nextInt();
        int res = 0;
        for (int i = 111; i <= 999; i += 111) {
            if (i >= N) {
                res = i;
                break;
            }
        }
        System.out.println(res);
        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();
        int res = 0;
        for (int i = 111; i <= 999; i += 111) {
            if (i >= N) {
                res = i;
                break;
            }
        }
        System.out.println(res);
        sc.close();
    }
}