import 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();
		List<Integer> p = new ArrayList<Integer>();
		for(int i=0;i<n;i++) {
			int a = scan.nextInt();
			p.add(a);
		}
		
		
		
		for(int i=0;i<100;i++) {
			if(!p.contains(x-i)) {
				System.out.println(x-i);
				break;
			}else if(!p.contains(x+i)){
				System.out.println(x+i);
				break;
			}
			
		}
		
	}	
	
	
	
}
  import java.util.*; util.* java public class Main {
	public static void main(String[] args) {
		Scanner scan = new Scanner(System.in);
		
		int x = scan.nextInt();
		int n = scan.nextInt();
		List<Integer> p = new ArrayList<Integer>();
		for(int i=0;i<n;i++) {
			int a = scan.nextInt();
			p.add(a);
		}
		
		
		
		for(int i=0;i<100;i++) {
			if(!p.contains(x-i)) {
				System.out.println(x-i);
				break;
			}else if(!p.contains(x+i)){
				System.out.println(x+i);
				break;
			}
			
		}
		
	}	
	
	
	
} Main public static void main(String[] args) {
		Scanner scan = new Scanner(System.in);
		
		int x = scan.nextInt();
		int n = scan.nextInt();
		List<Integer> p = new ArrayList<Integer>();
		for(int i=0;i<n;i++) {
			int a = scan.nextInt();
			p.add(a);
		}
		
		
		
		for(int i=0;i<100;i++) {
			if(!p.contains(x-i)) {
				System.out.println(x-i);
				break;
			}else if(!p.contains(x+i)){
				System.out.println(x+i);
				break;
			}
			
		}
		
	} main {
		Scanner scan = new Scanner(System.in);
		
		int x = scan.nextInt();
		int n = scan.nextInt();
		List<Integer> p = new ArrayList<Integer>();
		for(int i=0;i<n;i++) {
			int a = scan.nextInt();
			p.add(a);
		}
		
		
		
		for(int i=0;i<100;i++) {
			if(!p.contains(x-i)) {
				System.out.println(x-i);
				break;
			}else if(!p.contains(x+i)){
				System.out.println(x+i);
				break;
			}
			
		}
		
	} 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 List<Integer> p = new ArrayList<Integer>(); p new ArrayList<Integer>() for(int i=0;i<n;i++) {
			int a = scan.nextInt();
			p.add(a);
		} int i=0; int i=0; i 0 i<n i n i++ i++ i {
			int a = scan.nextInt();
			p.add(a);
		} {
			int a = scan.nextInt();
			p.add(a);
		} int a = scan.nextInt(); a scan.nextInt() scan.nextInt scan p.add(a) p.add p a for(int i=0;i<100;i++) {
			if(!p.contains(x-i)) {
				System.out.println(x-i);
				break;
			}else if(!p.contains(x+i)){
				System.out.println(x+i);
				break;
			}
			
		} int i=0; int i=0; i 0 i<100 i 100 i++ i++ i {
			if(!p.contains(x-i)) {
				System.out.println(x-i);
				break;
			}else if(!p.contains(x+i)){
				System.out.println(x+i);
				break;
			}
			
		} {
			if(!p.contains(x-i)) {
				System.out.println(x-i);
				break;
			}else if(!p.contains(x+i)){
				System.out.println(x+i);
				break;
			}
			
		} if(!p.contains(x-i)) {
				System.out.println(x-i);
				break;
			}else if(!p.contains(x+i)){
				System.out.println(x+i);
				break;
			} !p.contains(x-i) p.contains(x-i) p.contains p x-i x i {
				System.out.println(x-i);
				break;
			} System.out.println(x-i) System.out.println System.out System System.out x-i x i break; if(!p.contains(x+i)){
				System.out.println(x+i);
				break;
			} !p.contains(x+i) p.contains(x+i) p.contains p x+i x i {
				System.out.println(x+i);
				break;
			} System.out.println(x+i) System.out.println System.out System System.out x+i x i break; 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();
		List<Integer> p = new ArrayList<Integer>();
		for(int i=0;i<n;i++) {
			int a = scan.nextInt();
			p.add(a);
		}
		
		
		
		for(int i=0;i<100;i++) {
			if(!p.contains(x-i)) {
				System.out.println(x-i);
				break;
			}else if(!p.contains(x+i)){
				System.out.println(x+i);
				break;
			}
			
		}
		
	}	
	
	
	
} public class Main {
	public static void main(String[] args) {
		Scanner scan = new Scanner(System.in);
		
		int x = scan.nextInt();
		int n = scan.nextInt();
		List<Integer> p = new ArrayList<Integer>();
		for(int i=0;i<n;i++) {
			int a = scan.nextInt();
			p.add(a);
		}
		
		
		
		for(int i=0;i<100;i++) {
			if(!p.contains(x-i)) {
				System.out.println(x-i);
				break;
			}else if(!p.contains(x+i)){
				System.out.println(x+i);
				break;
			}
			
		}
		
	}	
	
	
	
} Main
import 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();
		List<Integer> p = new ArrayList<Integer>();
		for(int i=0;i<n;i++) {
			int a = scan.nextInt();
			p.add(a);
		}
		
		
		
		for(int i=0;i<100;i++) {
			if(!p.contains(x-i)) {
				System.out.println(x-i);
				break;
			}else if(!p.contains(x+i)){
				System.out.println(x+i);
				break;
			}
			
		}
		
	}	
	
	
	
}
 
