import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;

class Main {
	public static void main(String args[]) throws IOException {
		BufferedReader in = new BufferedReader(new InputStreamReader(System.in));
		Solver solver = new Solver();
		solver.init();
		solver.readHead(in.readLine());
		// for (; solver.hasNext();) {
		// solver.readBody(in.readLine());
		// }
		// solver.solve();
		// }
	}
}

class Solver {
	int N;
	int cnt;

	public void init() {
		N = 0;
		cnt = 0;
	}

	public void readHead(String str) {
		String[] strArr = str.split(" ");
		N = Integer.parseInt(strArr[0]);
		// System.out.println(N);
		for (;; N++) {
			if (N / 100 == ((N / 10) % 10) && (N / 100) == (N % 10)) {
				System.out.println(N);
				break;
			}
		}
	}

	public boolean hasNext() {
		return cnt < N;
	}

	public void readBody(String str) {
		// System.out.println(str);
		cnt++;
	}

	public void solve() {

	}
} import java.io.BufferedReader; BufferedReader java.io import java.io.IOException; IOException java.io import java.io.InputStreamReader; InputStreamReader java.io class Main {
	public static void main(String args[]) throws IOException {
		BufferedReader in = new BufferedReader(new InputStreamReader(System.in));
		Solver solver = new Solver();
		solver.init();
		solver.readHead(in.readLine());
		// for (; solver.hasNext();) {
		// solver.readBody(in.readLine());
		// }
		// solver.solve();
		// }
	}
} Main public static void main(String args[]) throws IOException {
		BufferedReader in = new BufferedReader(new InputStreamReader(System.in));
		Solver solver = new Solver();
		solver.init();
		solver.readHead(in.readLine());
		// for (; solver.hasNext();) {
		// solver.readBody(in.readLine());
		// }
		// solver.solve();
		// }
	} main {
		BufferedReader in = new BufferedReader(new InputStreamReader(System.in));
		Solver solver = new Solver();
		solver.init();
		solver.readHead(in.readLine());
		// for (; solver.hasNext();) {
		// solver.readBody(in.readLine());
		// }
		// solver.solve();
		// }
	} BufferedReader in = new BufferedReader(new InputStreamReader(System.in)); in new BufferedReader(new InputStreamReader(System.in)) Solver solver = new Solver(); solver new Solver() solver.init() solver.init solver solver.readHead(in.readLine()) solver.readHead solver in.readLine() in.readLine in String args[] args class Solver {
	int N;
	int cnt;

	public void init() {
		N = 0;
		cnt = 0;
	}

	public void readHead(String str) {
		String[] strArr = str.split(" ");
		N = Integer.parseInt(strArr[0]);
		// System.out.println(N);
		for (;; N++) {
			if (N / 100 == ((N / 10) % 10) && (N / 100) == (N % 10)) {
				System.out.println(N);
				break;
			}
		}
	}

	public boolean hasNext() {
		return cnt < N;
	}

	public void readBody(String str) {
		// System.out.println(str);
		cnt++;
	}

	public void solve() {

	}
} Solver int N; N int cnt; cnt public void init() {
		N = 0;
		cnt = 0;
	} init {
		N = 0;
		cnt = 0;
	} N = 0 N 0 cnt = 0 cnt 0 public void readHead(String str) {
		String[] strArr = str.split(" ");
		N = Integer.parseInt(strArr[0]);
		// System.out.println(N);
		for (;; N++) {
			if (N / 100 == ((N / 10) % 10) && (N / 100) == (N % 10)) {
				System.out.println(N);
				break;
			}
		}
	} readHead {
		String[] strArr = str.split(" ");
		N = Integer.parseInt(strArr[0]);
		// System.out.println(N);
		for (;; N++) {
			if (N / 100 == ((N / 10) % 10) && (N / 100) == (N % 10)) {
				System.out.println(N);
				break;
			}
		}
	} String[] strArr = str.split(" "); strArr str.split(" ") str.split str " " N = Integer.parseInt(strArr[0]) N Integer.parseInt(strArr[0]) Integer.parseInt Integer strArr[0] strArr 0 for (;; N++) {
			if (N / 100 == ((N / 10) % 10) && (N / 100) == (N % 10)) {
				System.out.println(N);
				break;
			}
		} ; N++ N++ N {
			if (N / 100 == ((N / 10) % 10) && (N / 100) == (N % 10)) {
				System.out.println(N);
				break;
			}
		} {
			if (N / 100 == ((N / 10) % 10) && (N / 100) == (N % 10)) {
				System.out.println(N);
				break;
			}
		} if (N / 100 == ((N / 10) % 10) && (N / 100) == (N % 10)) {
				System.out.println(N);
				break;
			} N / 100 == ((N / 10) % 10) && (N / 100) == (N % 10) N / 100 == ((N / 10) % 10) N / 100 N 100 ((N / 10) % 10) (N / 10) N 10 10 (N / 100) == (N % 10) (N / 100) N 100 (N % 10) N 10 {
				System.out.println(N);
				break;
			} System.out.println(N) System.out.println System.out System System.out N break; String str str public boolean hasNext() {
		return cnt < N;
	} hasNext {
		return cnt < N;
	} return cnt < N; cnt < N cnt N public void readBody(String str) {
		// System.out.println(str);
		cnt++;
	} readBody {
		// System.out.println(str);
		cnt++;
	} cnt++ cnt String str str public void solve() {

	} solve {

	}
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;

class Main {
	public static void main(String args[]) throws IOException {
		BufferedReader in = new BufferedReader(new InputStreamReader(System.in));
		Solver solver = new Solver();
		solver.init();
		solver.readHead(in.readLine());
		// for (; solver.hasNext();) {
		// solver.readBody(in.readLine());
		// }
		// solver.solve();
		// }
	}
}

class Solver {
	int N;
	int cnt;

	public void init() {
		N = 0;
		cnt = 0;
	}

	public void readHead(String str) {
		String[] strArr = str.split(" ");
		N = Integer.parseInt(strArr[0]);
		// System.out.println(N);
		for (;; N++) {
			if (N / 100 == ((N / 10) % 10) && (N / 100) == (N % 10)) {
				System.out.println(N);
				break;
			}
		}
	}

	public boolean hasNext() {
		return cnt < N;
	}

	public void readBody(String str) {
		// System.out.println(str);
		cnt++;
	}

	public void solve() {

	}
}
