import java.util.Scanner;

public class Main {
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		int n = sc.nextInt();
		int ans = 0;

		for (int i = n; i <= 999; i++) {
			if (i % 111 == 0) {
				ans = i;
				break;
			}
		}

		System.out.println(ans);

		sc.close();
	}

} 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 ans = 0;

		for (int i = n; i <= 999; i++) {
			if (i % 111 == 0) {
				ans = i;
				break;
			}
		}

		System.out.println(ans);

		sc.close();
	}

} Main public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		int n = sc.nextInt();
		int ans = 0;

		for (int i = n; i <= 999; i++) {
			if (i % 111 == 0) {
				ans = i;
				break;
			}
		}

		System.out.println(ans);

		sc.close();
	} main {
		Scanner sc = new Scanner(System.in);
		int n = sc.nextInt();
		int ans = 0;

		for (int i = n; i <= 999; i++) {
			if (i % 111 == 0) {
				ans = i;
				break;
			}
		}

		System.out.println(ans);

		sc.close();
	} Scanner sc = new Scanner(System.in); sc new Scanner(System.in) int n = sc.nextInt(); n sc.nextInt() sc.nextInt sc int ans = 0; ans 0 for (int i = n; i <= 999; i++) {
			if (i % 111 == 0) {
				ans = i;
				break;
			}
		} int i = n; int i = n; i n i <= 999 i 999 i++ i++ i {
			if (i % 111 == 0) {
				ans = i;
				break;
			}
		} {
			if (i % 111 == 0) {
				ans = i;
				break;
			}
		} if (i % 111 == 0) {
				ans = i;
				break;
			} i % 111 == 0 i % 111 i 111 0 {
				ans = i;
				break;
			} ans = i ans i break; System.out.println(ans) System.out.println System.out System System.out ans 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();
		int ans = 0;

		for (int i = n; i <= 999; i++) {
			if (i % 111 == 0) {
				ans = i;
				break;
			}
		}

		System.out.println(ans);

		sc.close();
	}

} public class Main {
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		int n = sc.nextInt();
		int ans = 0;

		for (int i = n; i <= 999; i++) {
			if (i % 111 == 0) {
				ans = i;
				break;
			}
		}

		System.out.println(ans);

		sc.close();
	}

} 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 ans = 0;

		for (int i = n; i <= 999; i++) {
			if (i % 111 == 0) {
				ans = i;
				break;
			}
		}

		System.out.println(ans);

		sc.close();
	}

}
