import java.util.ArrayList;
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();
		ArrayList<Integer> list = new ArrayList<Integer>();
		int abs = 99;
		int ans = 100;

		for(int i = 0;i < n;i++) {
			list.add(scan.nextInt());
		}

		for(int i = 0;i <= 200;i++) {
			if(!(list.contains(i))) {
				if(Math.abs(x - i) < abs) {
					abs = Math.abs(x - i);
					ans = i;
				}
			}
		}

		if(n == 0 || !(list.contains(x))) {
			System.out.println(x);
		}else {
			System.out.println(ans);
		}
	}
}

/tmp/hf-datasets-cache/medium/datasets/42704881117311-config-parquet-and-info-qiankunmu-Project_CodeNet-896c9d36/hub/datasets--qiankunmu--Project_CodeNet_Python800_and_Java250/snapshots/c899fde44a77ba1cc14973ed3de064e4ff3aadc7/Project_CodeNet_Java250.tar.gz