import java.util.Scanner;

public class Main{
    public static void main(String[] args){
	Scanner sc = new Scanner(System.in);
	int N = sc.nextInt();
	int re=0;
	if(N<=111) re=111;
	else if(N<=222) re=222;
	else if(N<=333) re=333;
	else if(N<=444) re=444;
	else if(N<=555) re=555;
	else if(N<=666) re=666;
	else if(N<=777) re=777;
	else if(N<=888) re=888;
	else re=999;
	System.out.print(re);
    }
} 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 re=0;
	if(N<=111) re=111;
	else if(N<=222) re=222;
	else if(N<=333) re=333;
	else if(N<=444) re=444;
	else if(N<=555) re=555;
	else if(N<=666) re=666;
	else if(N<=777) re=777;
	else if(N<=888) re=888;
	else re=999;
	System.out.print(re);
    }
} Main public static void main(String[] args){
	Scanner sc = new Scanner(System.in);
	int N = sc.nextInt();
	int re=0;
	if(N<=111) re=111;
	else if(N<=222) re=222;
	else if(N<=333) re=333;
	else if(N<=444) re=444;
	else if(N<=555) re=555;
	else if(N<=666) re=666;
	else if(N<=777) re=777;
	else if(N<=888) re=888;
	else re=999;
	System.out.print(re);
    } main {
	Scanner sc = new Scanner(System.in);
	int N = sc.nextInt();
	int re=0;
	if(N<=111) re=111;
	else if(N<=222) re=222;
	else if(N<=333) re=333;
	else if(N<=444) re=444;
	else if(N<=555) re=555;
	else if(N<=666) re=666;
	else if(N<=777) re=777;
	else if(N<=888) re=888;
	else re=999;
	System.out.print(re);
    } Scanner sc = new Scanner(System.in); sc new Scanner(System.in) int N = sc.nextInt(); N sc.nextInt() sc.nextInt sc int re=0; re 0 if(N<=111) re=111;
	else if(N<=222) re=222;
	else if(N<=333) re=333;
	else if(N<=444) re=444;
	else if(N<=555) re=555;
	else if(N<=666) re=666;
	else if(N<=777) re=777;
	else if(N<=888) re=888;
	else re=999; N<=111 N 111 re=111 re 111 if(N<=222) re=222;
	else if(N<=333) re=333;
	else if(N<=444) re=444;
	else if(N<=555) re=555;
	else if(N<=666) re=666;
	else if(N<=777) re=777;
	else if(N<=888) re=888;
	else re=999; N<=222 N 222 re=222 re 222 if(N<=333) re=333;
	else if(N<=444) re=444;
	else if(N<=555) re=555;
	else if(N<=666) re=666;
	else if(N<=777) re=777;
	else if(N<=888) re=888;
	else re=999; N<=333 N 333 re=333 re 333 if(N<=444) re=444;
	else if(N<=555) re=555;
	else if(N<=666) re=666;
	else if(N<=777) re=777;
	else if(N<=888) re=888;
	else re=999; N<=444 N 444 re=444 re 444 if(N<=555) re=555;
	else if(N<=666) re=666;
	else if(N<=777) re=777;
	else if(N<=888) re=888;
	else re=999; N<=555 N 555 re=555 re 555 if(N<=666) re=666;
	else if(N<=777) re=777;
	else if(N<=888) re=888;
	else re=999; N<=666 N 666 re=666 re 666 if(N<=777) re=777;
	else if(N<=888) re=888;
	else re=999; N<=777 N 777 re=777 re 777 if(N<=888) re=888;
	else re=999; N<=888 N 888 re=888 re 888 re=999 re 999 System.out.print(re) System.out.print System.out System System.out re String[] args args public class Main{
    public static void main(String[] args){
	Scanner sc = new Scanner(System.in);
	int N = sc.nextInt();
	int re=0;
	if(N<=111) re=111;
	else if(N<=222) re=222;
	else if(N<=333) re=333;
	else if(N<=444) re=444;
	else if(N<=555) re=555;
	else if(N<=666) re=666;
	else if(N<=777) re=777;
	else if(N<=888) re=888;
	else re=999;
	System.out.print(re);
    }
} public class Main{
    public static void main(String[] args){
	Scanner sc = new Scanner(System.in);
	int N = sc.nextInt();
	int re=0;
	if(N<=111) re=111;
	else if(N<=222) re=222;
	else if(N<=333) re=333;
	else if(N<=444) re=444;
	else if(N<=555) re=555;
	else if(N<=666) re=666;
	else if(N<=777) re=777;
	else if(N<=888) re=888;
	else re=999;
	System.out.print(re);
    }
} 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 re=0;
	if(N<=111) re=111;
	else if(N<=222) re=222;
	else if(N<=333) re=333;
	else if(N<=444) re=444;
	else if(N<=555) re=555;
	else if(N<=666) re=666;
	else if(N<=777) re=777;
	else if(N<=888) re=888;
	else re=999;
	System.out.print(re);
    }
}
