import java.util.Scanner;

public class Main {
	public static void main(String[] args) throws Exception {
		Scanner sc = new Scanner(System.in);
		int n = sc.nextInt();
		sc.close();

		for (int i = 111; i < 1000; i+=111) {
			if (i >= n) {
				System.out.println(i);
				return;
			}
		}
	}
} import java.util.Scanner; Scanner java.util public class Main {
	public static void main(String[] args) throws Exception {
		Scanner sc = new Scanner(System.in);
		int n = sc.nextInt();
		sc.close();

		for (int i = 111; i < 1000; i+=111) {
			if (i >= n) {
				System.out.println(i);
				return;
			}
		}
	}
} Main public static void main(String[] args) throws Exception {
		Scanner sc = new Scanner(System.in);
		int n = sc.nextInt();
		sc.close();

		for (int i = 111; i < 1000; i+=111) {
			if (i >= n) {
				System.out.println(i);
				return;
			}
		}
	} main {
		Scanner sc = new Scanner(System.in);
		int n = sc.nextInt();
		sc.close();

		for (int i = 111; i < 1000; i+=111) {
			if (i >= n) {
				System.out.println(i);
				return;
			}
		}
	} Scanner sc = new Scanner(System.in); sc new Scanner(System.in) int n = sc.nextInt(); n sc.nextInt() sc.nextInt sc sc.close() sc.close sc for (int i = 111; i < 1000; i+=111) {
			if (i >= n) {
				System.out.println(i);
				return;
			}
		} int i = 111; int i = 111; i 111 i < 1000 i 1000 i+=111 i+=111 i 111 {
			if (i >= n) {
				System.out.println(i);
				return;
			}
		} {
			if (i >= n) {
				System.out.println(i);
				return;
			}
		} if (i >= n) {
				System.out.println(i);
				return;
			} i >= n i n {
				System.out.println(i);
				return;
			} System.out.println(i) System.out.println System.out System System.out i return; String[] args args public class Main {
	public static void main(String[] args) throws Exception {
		Scanner sc = new Scanner(System.in);
		int n = sc.nextInt();
		sc.close();

		for (int i = 111; i < 1000; i+=111) {
			if (i >= n) {
				System.out.println(i);
				return;
			}
		}
	}
} public class Main {
	public static void main(String[] args) throws Exception {
		Scanner sc = new Scanner(System.in);
		int n = sc.nextInt();
		sc.close();

		for (int i = 111; i < 1000; i+=111) {
			if (i >= n) {
				System.out.println(i);
				return;
			}
		}
	}
} Main
import java.util.Scanner;

public class Main {
	public static void main(String[] args) throws Exception {
		Scanner sc = new Scanner(System.in);
		int n = sc.nextInt();
		sc.close();

		for (int i = 111; i < 1000; i+=111) {
			if (i >= n) {
				System.out.println(i);
				return;
			}
		}
	}
}
