import 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(112<=N && N <=222)System.out.println(222);
		else if(223<=N && N <=333)System.out.println(333);
		else if(334<=N && N <=444)System.out.println(444);
		else if(445<=N && N <=555)System.out.println(555);
		else if(556<=N && N <=666)System.out.println(666);
		else if(667<=N && N <=777)System.out.println(777);
		else if(778<=N && N <=888)System.out.println(888);
		else if(889<=N && N <=999)System.out.println(999);
		sc.close();
	}

} import java.util.*; util.* java 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(112<=N && N <=222)System.out.println(222);
		else if(223<=N && N <=333)System.out.println(333);
		else if(334<=N && N <=444)System.out.println(444);
		else if(445<=N && N <=555)System.out.println(555);
		else if(556<=N && N <=666)System.out.println(666);
		else if(667<=N && N <=777)System.out.println(777);
		else if(778<=N && N <=888)System.out.println(888);
		else if(889<=N && N <=999)System.out.println(999);
		sc.close();
	}

} 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(112<=N && N <=222)System.out.println(222);
		else if(223<=N && N <=333)System.out.println(333);
		else if(334<=N && N <=444)System.out.println(444);
		else if(445<=N && N <=555)System.out.println(555);
		else if(556<=N && N <=666)System.out.println(666);
		else if(667<=N && N <=777)System.out.println(777);
		else if(778<=N && N <=888)System.out.println(888);
		else if(889<=N && N <=999)System.out.println(999);
		sc.close();
	} main {
		Scanner sc = new Scanner(System.in);
		int N = sc.nextInt();
		if(N<=111)System.out.println(111);
		else if(112<=N && N <=222)System.out.println(222);
		else if(223<=N && N <=333)System.out.println(333);
		else if(334<=N && N <=444)System.out.println(444);
		else if(445<=N && N <=555)System.out.println(555);
		else if(556<=N && N <=666)System.out.println(666);
		else if(667<=N && N <=777)System.out.println(777);
		else if(778<=N && N <=888)System.out.println(888);
		else if(889<=N && N <=999)System.out.println(999);
		sc.close();
	} 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(112<=N && N <=222)System.out.println(222);
		else if(223<=N && N <=333)System.out.println(333);
		else if(334<=N && N <=444)System.out.println(444);
		else if(445<=N && N <=555)System.out.println(555);
		else if(556<=N && N <=666)System.out.println(666);
		else if(667<=N && N <=777)System.out.println(777);
		else if(778<=N && N <=888)System.out.println(888);
		else if(889<=N && N <=999)System.out.println(999); N<=111 N 111 System.out.println(111) System.out.println System.out System System.out 111 if(112<=N && N <=222)System.out.println(222);
		else if(223<=N && N <=333)System.out.println(333);
		else if(334<=N && N <=444)System.out.println(444);
		else if(445<=N && N <=555)System.out.println(555);
		else if(556<=N && N <=666)System.out.println(666);
		else if(667<=N && N <=777)System.out.println(777);
		else if(778<=N && N <=888)System.out.println(888);
		else if(889<=N && N <=999)System.out.println(999); 112<=N && N <=222 112<=N 112 N N <=222 N 222 System.out.println(222) System.out.println System.out System System.out 222 if(223<=N && N <=333)System.out.println(333);
		else if(334<=N && N <=444)System.out.println(444);
		else if(445<=N && N <=555)System.out.println(555);
		else if(556<=N && N <=666)System.out.println(666);
		else if(667<=N && N <=777)System.out.println(777);
		else if(778<=N && N <=888)System.out.println(888);
		else if(889<=N && N <=999)System.out.println(999); 223<=N && N <=333 223<=N 223 N N <=333 N 333 System.out.println(333) System.out.println System.out System System.out 333 if(334<=N && N <=444)System.out.println(444);
		else if(445<=N && N <=555)System.out.println(555);
		else if(556<=N && N <=666)System.out.println(666);
		else if(667<=N && N <=777)System.out.println(777);
		else if(778<=N && N <=888)System.out.println(888);
		else if(889<=N && N <=999)System.out.println(999); 334<=N && N <=444 334<=N 334 N N <=444 N 444 System.out.println(444) System.out.println System.out System System.out 444 if(445<=N && N <=555)System.out.println(555);
		else if(556<=N && N <=666)System.out.println(666);
		else if(667<=N && N <=777)System.out.println(777);
		else if(778<=N && N <=888)System.out.println(888);
		else if(889<=N && N <=999)System.out.println(999); 445<=N && N <=555 445<=N 445 N N <=555 N 555 System.out.println(555) System.out.println System.out System System.out 555 if(556<=N && N <=666)System.out.println(666);
		else if(667<=N && N <=777)System.out.println(777);
		else if(778<=N && N <=888)System.out.println(888);
		else if(889<=N && N <=999)System.out.println(999); 556<=N && N <=666 556<=N 556 N N <=666 N 666 System.out.println(666) System.out.println System.out System System.out 666 if(667<=N && N <=777)System.out.println(777);
		else if(778<=N && N <=888)System.out.println(888);
		else if(889<=N && N <=999)System.out.println(999); 667<=N && N <=777 667<=N 667 N N <=777 N 777 System.out.println(777) System.out.println System.out System System.out 777 if(778<=N && N <=888)System.out.println(888);
		else if(889<=N && N <=999)System.out.println(999); 778<=N && N <=888 778<=N 778 N N <=888 N 888 System.out.println(888) System.out.println System.out System System.out 888 if(889<=N && N <=999)System.out.println(999); 889<=N && N <=999 889<=N 889 N N <=999 N 999 System.out.println(999) System.out.println System.out System System.out 999 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();
		if(N<=111)System.out.println(111);
		else if(112<=N && N <=222)System.out.println(222);
		else if(223<=N && N <=333)System.out.println(333);
		else if(334<=N && N <=444)System.out.println(444);
		else if(445<=N && N <=555)System.out.println(555);
		else if(556<=N && N <=666)System.out.println(666);
		else if(667<=N && N <=777)System.out.println(777);
		else if(778<=N && N <=888)System.out.println(888);
		else if(889<=N && N <=999)System.out.println(999);
		sc.close();
	}

} 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(112<=N && N <=222)System.out.println(222);
		else if(223<=N && N <=333)System.out.println(333);
		else if(334<=N && N <=444)System.out.println(444);
		else if(445<=N && N <=555)System.out.println(555);
		else if(556<=N && N <=666)System.out.println(666);
		else if(667<=N && N <=777)System.out.println(777);
		else if(778<=N && N <=888)System.out.println(888);
		else if(889<=N && N <=999)System.out.println(999);
		sc.close();
	}

} Main
import 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(112<=N && N <=222)System.out.println(222);
		else if(223<=N && N <=333)System.out.println(333);
		else if(334<=N && N <=444)System.out.println(444);
		else if(445<=N && N <=555)System.out.println(555);
		else if(556<=N && N <=666)System.out.println(666);
		else if(667<=N && N <=777)System.out.println(777);
		else if(778<=N && N <=888)System.out.println(888);
		else if(889<=N && N <=999)System.out.println(999);
		sc.close();
	}

}