import java.util.*;


public class Main {
    public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		int x = sc.nextInt();
		int n = sc.nextInt();
		int ans = 102;
		int re = 0;
		List<Integer> p = new ArrayList<Integer>();
		
		for(int i =0; i<n; i++) {
		    p.add(sc.nextInt());
		}
		
		
		for(int i=101;i>=0;i--) {
		    if(!p.contains(i)) {
		        if(ans>=Math.abs(x-i)) {
		            ans=Math.abs(x-i);
		            re = i;
		        }
		    }
		}
		System.out.println(re);
    }
}
/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