import java.util.Arrays;
import java.util.Scanner;

public class Main {

	public static void main(String[] args) {
		Scanner scan = new Scanner(System.in);
		int X = scan.nextInt();
		int N = scan.nextInt();
		Integer p[] = new Integer[N];
		//int min = Math.abs(100 - X);
		int min = 100;
        int result = X;

		for (int i = 0; i < N; i++) {
			p[i] = scan.nextInt();
		}

		for (int i = 0; i <= 200; i++) {
			if (Math.abs(X - i) < min && !Arrays.asList(p).contains(i)) {
				min = Math.abs(X - i);
				result = i;
			}
		}

		System.out.println(result);

	}

} import java.util.Arrays; Arrays java.util import java.util.Scanner; Scanner java.util public class Main {

	public static void main(String[] args) {
		Scanner scan = new Scanner(System.in);
		int X = scan.nextInt();
		int N = scan.nextInt();
		Integer p[] = new Integer[N];
		//int min = Math.abs(100 - X);
		int min = 100;
        int result = X;

		for (int i = 0; i < N; i++) {
			p[i] = scan.nextInt();
		}

		for (int i = 0; i <= 200; i++) {
			if (Math.abs(X - i) < min && !Arrays.asList(p).contains(i)) {
				min = Math.abs(X - i);
				result = i;
			}
		}

		System.out.println(result);

	}

} Main public static void main(String[] args) {
		Scanner scan = new Scanner(System.in);
		int X = scan.nextInt();
		int N = scan.nextInt();
		Integer p[] = new Integer[N];
		//int min = Math.abs(100 - X);
		int min = 100;
        int result = X;

		for (int i = 0; i < N; i++) {
			p[i] = scan.nextInt();
		}

		for (int i = 0; i <= 200; i++) {
			if (Math.abs(X - i) < min && !Arrays.asList(p).contains(i)) {
				min = Math.abs(X - i);
				result = i;
			}
		}

		System.out.println(result);

	} main {
		Scanner scan = new Scanner(System.in);
		int X = scan.nextInt();
		int N = scan.nextInt();
		Integer p[] = new Integer[N];
		//int min = Math.abs(100 - X);
		int min = 100;
        int result = X;

		for (int i = 0; i < N; i++) {
			p[i] = scan.nextInt();
		}

		for (int i = 0; i <= 200; i++) {
			if (Math.abs(X - i) < min && !Arrays.asList(p).contains(i)) {
				min = Math.abs(X - i);
				result = i;
			}
		}

		System.out.println(result);

	} Scanner scan = new Scanner(System.in); scan new Scanner(System.in) int X = scan.nextInt(); X scan.nextInt() scan.nextInt scan int N = scan.nextInt(); N scan.nextInt() scan.nextInt scan Integer p[] = new Integer[N]; p new Integer[N] N int min = 100; min 100 int result = X; result X for (int i = 0; i < N; i++) {
			p[i] = scan.nextInt();
		} int i = 0; int i = 0; i 0 i < N i N i++ i++ i {
			p[i] = scan.nextInt();
		} {
			p[i] = scan.nextInt();
		} p[i] = scan.nextInt() p[i] p i scan.nextInt() scan.nextInt scan for (int i = 0; i <= 200; i++) {
			if (Math.abs(X - i) < min && !Arrays.asList(p).contains(i)) {
				min = Math.abs(X - i);
				result = i;
			}
		} int i = 0; int i = 0; i 0 i <= 200 i 200 i++ i++ i {
			if (Math.abs(X - i) < min && !Arrays.asList(p).contains(i)) {
				min = Math.abs(X - i);
				result = i;
			}
		} {
			if (Math.abs(X - i) < min && !Arrays.asList(p).contains(i)) {
				min = Math.abs(X - i);
				result = i;
			}
		} if (Math.abs(X - i) < min && !Arrays.asList(p).contains(i)) {
				min = Math.abs(X - i);
				result = i;
			} Math.abs(X - i) < min && !Arrays.asList(p).contains(i) Math.abs(X - i) < min Math.abs(X - i) Math.abs Math X - i X i min !Arrays.asList(p).contains(i) Arrays.asList(p).contains(i) Arrays.asList(p).contains Arrays.asList(p) Arrays.asList Arrays p i {
				min = Math.abs(X - i);
				result = i;
			} min = Math.abs(X - i) min Math.abs(X - i) Math.abs Math X - i X i result = i result i System.out.println(result) System.out.println System.out System System.out result String[] args args public class Main {

	public static void main(String[] args) {
		Scanner scan = new Scanner(System.in);
		int X = scan.nextInt();
		int N = scan.nextInt();
		Integer p[] = new Integer[N];
		//int min = Math.abs(100 - X);
		int min = 100;
        int result = X;

		for (int i = 0; i < N; i++) {
			p[i] = scan.nextInt();
		}

		for (int i = 0; i <= 200; i++) {
			if (Math.abs(X - i) < min && !Arrays.asList(p).contains(i)) {
				min = Math.abs(X - i);
				result = i;
			}
		}

		System.out.println(result);

	}

} public class Main {

	public static void main(String[] args) {
		Scanner scan = new Scanner(System.in);
		int X = scan.nextInt();
		int N = scan.nextInt();
		Integer p[] = new Integer[N];
		//int min = Math.abs(100 - X);
		int min = 100;
        int result = X;

		for (int i = 0; i < N; i++) {
			p[i] = scan.nextInt();
		}

		for (int i = 0; i <= 200; i++) {
			if (Math.abs(X - i) < min && !Arrays.asList(p).contains(i)) {
				min = Math.abs(X - i);
				result = i;
			}
		}

		System.out.println(result);

	}

} Main
import java.util.Arrays;
import java.util.Scanner;

public class Main {

	public static void main(String[] args) {
		Scanner scan = new Scanner(System.in);
		int X = scan.nextInt();
		int N = scan.nextInt();
		Integer p[] = new Integer[N];
		//int min = Math.abs(100 - X);
		int min = 100;
        int result = X;

		for (int i = 0; i < N; i++) {
			p[i] = scan.nextInt();
		}

		for (int i = 0; i <= 200; i++) {
			if (Math.abs(X - i) < min && !Arrays.asList(p).contains(i)) {
				min = Math.abs(X - i);
				result = i;
			}
		}

		System.out.println(result);

	}

}