import java.util.Scanner;
public class Main {

	public static void main(String[] args) {

		Scanner sc = new Scanner(System.in);

		int N = sc.nextInt();

		if(N<=111) System.out.println(111);

		else if(N<=222) System.out.println(222);

		else if(N<=333) System.out.println(333);

		else if(N<=444) System.out.println(444);

		else if(N<=555) System.out.println(555);

		else if(N<=666) System.out.println(666);

		else if(N<=777) System.out.println(777);

		else if(N<=888) System.out.println(888);

		else if(N<=999) System.out.println(999);


	}

} 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();

		if(N<=111) System.out.println(111);

		else if(N<=222) System.out.println(222);

		else if(N<=333) System.out.println(333);

		else if(N<=444) System.out.println(444);

		else if(N<=555) System.out.println(555);

		else if(N<=666) System.out.println(666);

		else if(N<=777) System.out.println(777);

		else if(N<=888) System.out.println(888);

		else if(N<=999) System.out.println(999);


	}

} Main public static void main(String[] args) {

		Scanner sc = new Scanner(System.in);

		int N = sc.nextInt();

		if(N<=111) System.out.println(111);

		else if(N<=222) System.out.println(222);

		else if(N<=333) System.out.println(333);

		else if(N<=444) System.out.println(444);

		else if(N<=555) System.out.println(555);

		else if(N<=666) System.out.println(666);

		else if(N<=777) System.out.println(777);

		else if(N<=888) System.out.println(888);

		else if(N<=999) System.out.println(999);


	} main {

		Scanner sc = new Scanner(System.in);

		int N = sc.nextInt();

		if(N<=111) System.out.println(111);

		else if(N<=222) System.out.println(222);

		else if(N<=333) System.out.println(333);

		else if(N<=444) System.out.println(444);

		else if(N<=555) System.out.println(555);

		else if(N<=666) System.out.println(666);

		else if(N<=777) System.out.println(777);

		else if(N<=888) System.out.println(888);

		else if(N<=999) System.out.println(999);


	} Scanner sc = new Scanner(System.in); sc new Scanner(System.in) int N = sc.nextInt(); N sc.nextInt() sc.nextInt sc if(N<=111) System.out.println(111);

		else if(N<=222) System.out.println(222);

		else if(N<=333) System.out.println(333);

		else if(N<=444) System.out.println(444);

		else if(N<=555) System.out.println(555);

		else if(N<=666) System.out.println(666);

		else if(N<=777) System.out.println(777);

		else if(N<=888) System.out.println(888);

		else if(N<=999) System.out.println(999); N<=111 N 111 System.out.println(111) System.out.println System.out System System.out 111 if(N<=222) System.out.println(222);

		else if(N<=333) System.out.println(333);

		else if(N<=444) System.out.println(444);

		else if(N<=555) System.out.println(555);

		else if(N<=666) System.out.println(666);

		else if(N<=777) System.out.println(777);

		else if(N<=888) System.out.println(888);

		else if(N<=999) System.out.println(999); N<=222 N 222 System.out.println(222) System.out.println System.out System System.out 222 if(N<=333) System.out.println(333);

		else if(N<=444) System.out.println(444);

		else if(N<=555) System.out.println(555);

		else if(N<=666) System.out.println(666);

		else if(N<=777) System.out.println(777);

		else if(N<=888) System.out.println(888);

		else if(N<=999) System.out.println(999); N<=333 N 333 System.out.println(333) System.out.println System.out System System.out 333 if(N<=444) System.out.println(444);

		else if(N<=555) System.out.println(555);

		else if(N<=666) System.out.println(666);

		else if(N<=777) System.out.println(777);

		else if(N<=888) System.out.println(888);

		else if(N<=999) System.out.println(999); N<=444 N 444 System.out.println(444) System.out.println System.out System System.out 444 if(N<=555) System.out.println(555);

		else if(N<=666) System.out.println(666);

		else if(N<=777) System.out.println(777);

		else if(N<=888) System.out.println(888);

		else if(N<=999) System.out.println(999); N<=555 N 555 System.out.println(555) System.out.println System.out System System.out 555 if(N<=666) System.out.println(666);

		else if(N<=777) System.out.println(777);

		else if(N<=888) System.out.println(888);

		else if(N<=999) System.out.println(999); N<=666 N 666 System.out.println(666) System.out.println System.out System System.out 666 if(N<=777) System.out.println(777);

		else if(N<=888) System.out.println(888);

		else if(N<=999) System.out.println(999); N<=777 N 777 System.out.println(777) System.out.println System.out System System.out 777 if(N<=888) System.out.println(888);

		else if(N<=999) System.out.println(999); N<=888 N 888 System.out.println(888) System.out.println System.out System System.out 888 if(N<=999) System.out.println(999); N<=999 N 999 System.out.println(999) System.out.println System.out System System.out 999 String[] args args public class Main {

	public static void main(String[] args) {

		Scanner sc = new Scanner(System.in);

		int N = sc.nextInt();

		if(N<=111) System.out.println(111);

		else if(N<=222) System.out.println(222);

		else if(N<=333) System.out.println(333);

		else if(N<=444) System.out.println(444);

		else if(N<=555) System.out.println(555);

		else if(N<=666) System.out.println(666);

		else if(N<=777) System.out.println(777);

		else if(N<=888) System.out.println(888);

		else if(N<=999) System.out.println(999);


	}

} public class Main {

	public static void main(String[] args) {

		Scanner sc = new Scanner(System.in);

		int N = sc.nextInt();

		if(N<=111) System.out.println(111);

		else if(N<=222) System.out.println(222);

		else if(N<=333) System.out.println(333);

		else if(N<=444) System.out.println(444);

		else if(N<=555) System.out.println(555);

		else if(N<=666) System.out.println(666);

		else if(N<=777) System.out.println(777);

		else if(N<=888) System.out.println(888);

		else if(N<=999) System.out.println(999);


	}

} Main
import java.util.Scanner;
public class Main {

	public static void main(String[] args) {

		Scanner sc = new Scanner(System.in);

		int N = sc.nextInt();

		if(N<=111) System.out.println(111);

		else if(N<=222) System.out.println(222);

		else if(N<=333) System.out.println(333);

		else if(N<=444) System.out.println(444);

		else if(N<=555) System.out.println(555);

		else if(N<=666) System.out.println(666);

		else if(N<=777) System.out.println(777);

		else if(N<=888) System.out.println(888);

		else if(N<=999) System.out.println(999);


	}

}
