
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.StringTokenizer;

public class Main {
  public static void main(String[] args) {
	  FastReader sc = new FastReader();
	  int n = sc.nextInt();
	  int[] nums = {111, 222, 333, 444, 555, 666, 777, 888, 999};
	  
	  for (int i = 0; i < nums.length; i++) {
		  if (n <= nums[i]) {
			  System.out.println(nums[i]);
			  System.exit(0);
		  }
	  }
	  
  }
 
  static class FastReader {
    BufferedReader br;
    StringTokenizer st;

    public FastReader() {
      br = new BufferedReader(new InputStreamReader(System.in));
    }
  
    String next() { 
      while (st == null || !st.hasMoreElements()) {
        try {
          st = new StringTokenizer(br.readLine());
        } catch (IOException  e) {
          e.printStackTrace();
        }
      }
      return st.nextToken();
    }

    int nextInt() {
      return Integer.parseInt(next());
    }

    long nextLong() {
      return Long.parseLong(next());
    }

    double nextDouble() { 
      return Double.parseDouble(next());
    }

    String nextLine() {
      String str = "";
        try{
            str = br.readLine();
        } catch (IOException e) {
            e.printStackTrace();
        }
        return str;
      }
  }
}

class Work {
	int spend;
	int earn;
	
	public Work(int spend, int earn) {
		this.spend = spend;
		this.earn = earn;
	}
} import java.io.BufferedReader; BufferedReader java.io import java.io.IOException; IOException java.io import java.io.InputStreamReader; InputStreamReader java.io import java.util.StringTokenizer; StringTokenizer java.util public class Main {
  public static void main(String[] args) {
	  FastReader sc = new FastReader();
	  int n = sc.nextInt();
	  int[] nums = {111, 222, 333, 444, 555, 666, 777, 888, 999};
	  
	  for (int i = 0; i < nums.length; i++) {
		  if (n <= nums[i]) {
			  System.out.println(nums[i]);
			  System.exit(0);
		  }
	  }
	  
  }
 
  static class FastReader {
    BufferedReader br;
    StringTokenizer st;

    public FastReader() {
      br = new BufferedReader(new InputStreamReader(System.in));
    }
  
    String next() { 
      while (st == null || !st.hasMoreElements()) {
        try {
          st = new StringTokenizer(br.readLine());
        } catch (IOException  e) {
          e.printStackTrace();
        }
      }
      return st.nextToken();
    }

    int nextInt() {
      return Integer.parseInt(next());
    }

    long nextLong() {
      return Long.parseLong(next());
    }

    double nextDouble() { 
      return Double.parseDouble(next());
    }

    String nextLine() {
      String str = "";
        try{
            str = br.readLine();
        } catch (IOException e) {
            e.printStackTrace();
        }
        return str;
      }
  }
} Main public static void main(String[] args) {
	  FastReader sc = new FastReader();
	  int n = sc.nextInt();
	  int[] nums = {111, 222, 333, 444, 555, 666, 777, 888, 999};
	  
	  for (int i = 0; i < nums.length; i++) {
		  if (n <= nums[i]) {
			  System.out.println(nums[i]);
			  System.exit(0);
		  }
	  }
	  
  } main {
	  FastReader sc = new FastReader();
	  int n = sc.nextInt();
	  int[] nums = {111, 222, 333, 444, 555, 666, 777, 888, 999};
	  
	  for (int i = 0; i < nums.length; i++) {
		  if (n <= nums[i]) {
			  System.out.println(nums[i]);
			  System.exit(0);
		  }
	  }
	  
  } FastReader sc = new FastReader(); sc new FastReader() int n = sc.nextInt(); n sc.nextInt() sc.nextInt sc int[] nums = {111, 222, 333, 444, 555, 666, 777, 888, 999}; nums {111, 222, 333, 444, 555, 666, 777, 888, 999} 111 222 333 444 555 666 777 888 999 for (int i = 0; i < nums.length; i++) {
		  if (n <= nums[i]) {
			  System.out.println(nums[i]);
			  System.exit(0);
		  }
	  } int i = 0; int i = 0; i 0 i < nums.length i nums.length nums nums.length i++ i++ i {
		  if (n <= nums[i]) {
			  System.out.println(nums[i]);
			  System.exit(0);
		  }
	  } {
		  if (n <= nums[i]) {
			  System.out.println(nums[i]);
			  System.exit(0);
		  }
	  } if (n <= nums[i]) {
			  System.out.println(nums[i]);
			  System.exit(0);
		  } n <= nums[i] n nums[i] nums i {
			  System.out.println(nums[i]);
			  System.exit(0);
		  } System.out.println(nums[i]) System.out.println System.out System System.out nums[i] nums i System.exit(0) System.exit System 0 String[] args args static class FastReader {
    BufferedReader br;
    StringTokenizer st;

    public FastReader() {
      br = new BufferedReader(new InputStreamReader(System.in));
    }
  
    String next() { 
      while (st == null || !st.hasMoreElements()) {
        try {
          st = new StringTokenizer(br.readLine());
        } catch (IOException  e) {
          e.printStackTrace();
        }
      }
      return st.nextToken();
    }

    int nextInt() {
      return Integer.parseInt(next());
    }

    long nextLong() {
      return Long.parseLong(next());
    }

    double nextDouble() { 
      return Double.parseDouble(next());
    }

    String nextLine() {
      String str = "";
        try{
            str = br.readLine();
        } catch (IOException e) {
            e.printStackTrace();
        }
        return str;
      }
  } FastReader BufferedReader br; br StringTokenizer st; st public FastReader() {
      br = new BufferedReader(new InputStreamReader(System.in));
    } FastReader {
      br = new BufferedReader(new InputStreamReader(System.in));
    } br = new BufferedReader(new InputStreamReader(System.in)) br new BufferedReader(new InputStreamReader(System.in)) String next() { 
      while (st == null || !st.hasMoreElements()) {
        try {
          st = new StringTokenizer(br.readLine());
        } catch (IOException  e) {
          e.printStackTrace();
        }
      }
      return st.nextToken();
    } next { 
      while (st == null || !st.hasMoreElements()) {
        try {
          st = new StringTokenizer(br.readLine());
        } catch (IOException  e) {
          e.printStackTrace();
        }
      }
      return st.nextToken();
    } while (st == null || !st.hasMoreElements()) {
        try {
          st = new StringTokenizer(br.readLine());
        } catch (IOException  e) {
          e.printStackTrace();
        }
      } st == null || !st.hasMoreElements() st == null st null !st.hasMoreElements() st.hasMoreElements() st.hasMoreElements st {
        try {
          st = new StringTokenizer(br.readLine());
        } catch (IOException  e) {
          e.printStackTrace();
        }
      } try {
          st = new StringTokenizer(br.readLine());
        } catch (IOException  e) {
          e.printStackTrace();
        } catch (IOException  e) {
          e.printStackTrace();
        } IOException  e {
          e.printStackTrace();
        } e.printStackTrace() e.printStackTrace e {
          st = new StringTokenizer(br.readLine());
        } st = new StringTokenizer(br.readLine()) st new StringTokenizer(br.readLine()) return st.nextToken(); st.nextToken() st.nextToken st int nextInt() {
      return Integer.parseInt(next());
    } nextInt {
      return Integer.parseInt(next());
    } return Integer.parseInt(next()); Integer.parseInt(next()) Integer.parseInt Integer next() next long nextLong() {
      return Long.parseLong(next());
    } nextLong {
      return Long.parseLong(next());
    } return Long.parseLong(next()); Long.parseLong(next()) Long.parseLong Long next() next double nextDouble() { 
      return Double.parseDouble(next());
    } nextDouble { 
      return Double.parseDouble(next());
    } return Double.parseDouble(next()); Double.parseDouble(next()) Double.parseDouble Double next() next String nextLine() {
      String str = "";
        try{
            str = br.readLine();
        } catch (IOException e) {
            e.printStackTrace();
        }
        return str;
      } nextLine {
      String str = "";
        try{
            str = br.readLine();
        } catch (IOException e) {
            e.printStackTrace();
        }
        return str;
      } String str = ""; str "" try{
            str = br.readLine();
        } catch (IOException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        } IOException e {
            e.printStackTrace();
        } e.printStackTrace() e.printStackTrace e {
            str = br.readLine();
        } str = br.readLine() str br.readLine() br.readLine br return str; str class Work {
	int spend;
	int earn;
	
	public Work(int spend, int earn) {
		this.spend = spend;
		this.earn = earn;
	}
} Work int spend; spend int earn; earn public Work(int spend, int earn) {
		this.spend = spend;
		this.earn = earn;
	} Work {
		this.spend = spend;
		this.earn = earn;
	} this.spend = spend this.spend this this.spend spend this.earn = earn this.earn this this.earn earn int spend spend int earn earn public class Main {
  public static void main(String[] args) {
	  FastReader sc = new FastReader();
	  int n = sc.nextInt();
	  int[] nums = {111, 222, 333, 444, 555, 666, 777, 888, 999};
	  
	  for (int i = 0; i < nums.length; i++) {
		  if (n <= nums[i]) {
			  System.out.println(nums[i]);
			  System.exit(0);
		  }
	  }
	  
  }
 
  static class FastReader {
    BufferedReader br;
    StringTokenizer st;

    public FastReader() {
      br = new BufferedReader(new InputStreamReader(System.in));
    }
  
    String next() { 
      while (st == null || !st.hasMoreElements()) {
        try {
          st = new StringTokenizer(br.readLine());
        } catch (IOException  e) {
          e.printStackTrace();
        }
      }
      return st.nextToken();
    }

    int nextInt() {
      return Integer.parseInt(next());
    }

    long nextLong() {
      return Long.parseLong(next());
    }

    double nextDouble() { 
      return Double.parseDouble(next());
    }

    String nextLine() {
      String str = "";
        try{
            str = br.readLine();
        } catch (IOException e) {
            e.printStackTrace();
        }
        return str;
      }
  }
} public class Main {
  public static void main(String[] args) {
	  FastReader sc = new FastReader();
	  int n = sc.nextInt();
	  int[] nums = {111, 222, 333, 444, 555, 666, 777, 888, 999};
	  
	  for (int i = 0; i < nums.length; i++) {
		  if (n <= nums[i]) {
			  System.out.println(nums[i]);
			  System.exit(0);
		  }
	  }
	  
  }
 
  static class FastReader {
    BufferedReader br;
    StringTokenizer st;

    public FastReader() {
      br = new BufferedReader(new InputStreamReader(System.in));
    }
  
    String next() { 
      while (st == null || !st.hasMoreElements()) {
        try {
          st = new StringTokenizer(br.readLine());
        } catch (IOException  e) {
          e.printStackTrace();
        }
      }
      return st.nextToken();
    }

    int nextInt() {
      return Integer.parseInt(next());
    }

    long nextLong() {
      return Long.parseLong(next());
    }

    double nextDouble() { 
      return Double.parseDouble(next());
    }

    String nextLine() {
      String str = "";
        try{
            str = br.readLine();
        } catch (IOException e) {
            e.printStackTrace();
        }
        return str;
      }
  }
} Main

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.StringTokenizer;

public class Main {
  public static void main(String[] args) {
	  FastReader sc = new FastReader();
	  int n = sc.nextInt();
	  int[] nums = {111, 222, 333, 444, 555, 666, 777, 888, 999};
	  
	  for (int i = 0; i < nums.length; i++) {
		  if (n <= nums[i]) {
			  System.out.println(nums[i]);
			  System.exit(0);
		  }
	  }
	  
  }
 
  static class FastReader {
    BufferedReader br;
    StringTokenizer st;

    public FastReader() {
      br = new BufferedReader(new InputStreamReader(System.in));
    }
  
    String next() { 
      while (st == null || !st.hasMoreElements()) {
        try {
          st = new StringTokenizer(br.readLine());
        } catch (IOException  e) {
          e.printStackTrace();
        }
      }
      return st.nextToken();
    }

    int nextInt() {
      return Integer.parseInt(next());
    }

    long nextLong() {
      return Long.parseLong(next());
    }

    double nextDouble() { 
      return Double.parseDouble(next());
    }

    String nextLine() {
      String str = "";
        try{
            str = br.readLine();
        } catch (IOException e) {
            e.printStackTrace();
        }
        return str;
      }
  }
}

class Work {
	int spend;
	int earn;
	
	public Work(int spend, int earn) {
		this.spend = spend;
		this.earn = earn;
	}
}
