import java.util.*;

public class Main {
  public static void main(String[] args) {
    Scanner sc = new Scanner(System.in);
    int N = sc.nextInt();

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

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

    int ans = 0;
    for (int i = 111; i <= 999; i+=111) {
      if (N <= i) {
        ans = i;
        break;
      }
    }
    System.out.println(ans);
  } main {
    Scanner sc = new Scanner(System.in);
    int N = sc.nextInt();

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

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

    int ans = 0;
    for (int i = 111; i <= 999; i+=111) {
      if (N <= i) {
        ans = i;
        break;
      }
    }
    System.out.println(ans);
  }
} Main
import java.util.*;

public class Main {
  public static void main(String[] args) {
    Scanner sc = new Scanner(System.in);
    int N = sc.nextInt();

    int ans = 0;
    for (int i = 111; i <= 999; i+=111) {
      if (N <= i) {
        ans = i;
        break;
      }
    }
    System.out.println(ans);
  }
}