
import java.util.Scanner;

public class Main {
	public static void main(String[] args) {
		Scanner scan = new Scanner(System.in);
		int N =Integer.parseInt(scan.next());
		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 scan = new Scanner(System.in);
		int N =Integer.parseInt(scan.next());
		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 scan = new Scanner(System.in);
		int N =Integer.parseInt(scan.next());
		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 scan = new Scanner(System.in);
		int N =Integer.parseInt(scan.next());
		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 scan = new Scanner(System.in); scan new Scanner(System.in) int N =Integer.parseInt(scan.next()); N Integer.parseInt(scan.next()) Integer.parseInt Integer scan.next() scan.next scan 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(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(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(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(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(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(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(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(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(999) System.out.println System.out System System.out 999 String[] args args public class Main {
	public static void main(String[] args) {
		Scanner scan = new Scanner(System.in);
		int N =Integer.parseInt(scan.next());
		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 scan = new Scanner(System.in);
		int N =Integer.parseInt(scan.next());
		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 scan = new Scanner(System.in);
		int N =Integer.parseInt(scan.next());
		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);
		}
	}
}
