import java.util.ArrayList;
import java.util.List;
import java.util.Scanner;

public class Main {
	public static void main(String[] args) throws Exception {
        Scanner sc = new Scanner(System.in);
        Main m = new Main(sc);
        m.show(m.solve());
        sc.close();
    }
    
	//フィールド
    Scanner sc;
    int X;
    int N;
    List<Integer> p = new ArrayList<Integer>();;
    
    //入力
    Main(Scanner sc) {
        this.sc = sc;
        this.X = sc.nextInt();
        this.N = sc.nextInt();
        for (int i = 0; i< N; i++) {
        	p.add(sc.nextInt());
        }
    }
    
    //解答処理
    private int solve() {
        int answer = 0;
        
        for (int i = 0; i<= 100; i++) {
        	if (!p.contains(X - i)) {
        		answer = X - i;
        		break;
        	} else if (!p.contains(X + i)) {
        		answer = X + i;
        		break;
        	}
        }
        
        return answer;
    }
    
    //出力
    public void show(int answer) {
        System.out.println(answer);
    }

} import java.util.ArrayList; ArrayList java.util import java.util.List; List java.util import java.util.Scanner; Scanner java.util public class Main {
	public static void main(String[] args) throws Exception {
        Scanner sc = new Scanner(System.in);
        Main m = new Main(sc);
        m.show(m.solve());
        sc.close();
    }
    
	//フィールド
    Scanner sc;
    int X;
    int N;
    List<Integer> p = new ArrayList<Integer>();;
    
    //入力
    Main(Scanner sc) {
        this.sc = sc;
        this.X = sc.nextInt();
        this.N = sc.nextInt();
        for (int i = 0; i< N; i++) {
        	p.add(sc.nextInt());
        }
    }
    
    //解答処理
    private int solve() {
        int answer = 0;
        
        for (int i = 0; i<= 100; i++) {
        	if (!p.contains(X - i)) {
        		answer = X - i;
        		break;
        	} else if (!p.contains(X + i)) {
        		answer = X + i;
        		break;
        	}
        }
        
        return answer;
    }
    
    //出力
    public void show(int answer) {
        System.out.println(answer);
    }

} Main //フィールド
    Scanner sc; sc int X; X int N; N List<Integer> p = new ArrayList<Integer>(); p new ArrayList<Integer>() public static void main(String[] args) throws Exception {
        Scanner sc = new Scanner(System.in);
        Main m = new Main(sc);
        m.show(m.solve());
        sc.close();
    } main {
        Scanner sc = new Scanner(System.in);
        Main m = new Main(sc);
        m.show(m.solve());
        sc.close();
    } Scanner sc = new Scanner(System.in); sc new Scanner(System.in) Main m = new Main(sc); m new Main(sc) m.show(m.solve()) m.show m m.solve() m.solve m sc.close() sc.close sc String[] args args //入力
    Main(Scanner sc) {
        this.sc = sc;
        this.X = sc.nextInt();
        this.N = sc.nextInt();
        for (int i = 0; i< N; i++) {
        	p.add(sc.nextInt());
        }
    } Main {
        this.sc = sc;
        this.X = sc.nextInt();
        this.N = sc.nextInt();
        for (int i = 0; i< N; i++) {
        	p.add(sc.nextInt());
        }
    } this.sc = sc this.sc this this.sc sc this.X = sc.nextInt() this.X this this.X sc.nextInt() sc.nextInt sc this.N = sc.nextInt() this.N this this.N sc.nextInt() sc.nextInt sc for (int i = 0; i< N; i++) {
        	p.add(sc.nextInt());
        } int i = 0; int i = 0; i 0 i< N i N i++ i++ i {
        	p.add(sc.nextInt());
        } {
        	p.add(sc.nextInt());
        } p.add(sc.nextInt()) p.add p sc.nextInt() sc.nextInt sc Scanner sc sc //解答処理
    private int solve() {
        int answer = 0;
        
        for (int i = 0; i<= 100; i++) {
        	if (!p.contains(X - i)) {
        		answer = X - i;
        		break;
        	} else if (!p.contains(X + i)) {
        		answer = X + i;
        		break;
        	}
        }
        
        return answer;
    } solve {
        int answer = 0;
        
        for (int i = 0; i<= 100; i++) {
        	if (!p.contains(X - i)) {
        		answer = X - i;
        		break;
        	} else if (!p.contains(X + i)) {
        		answer = X + i;
        		break;
        	}
        }
        
        return answer;
    } int answer = 0; answer 0 for (int i = 0; i<= 100; i++) {
        	if (!p.contains(X - i)) {
        		answer = X - i;
        		break;
        	} else if (!p.contains(X + i)) {
        		answer = X + i;
        		break;
        	}
        } int i = 0; int i = 0; i 0 i<= 100 i 100 i++ i++ i {
        	if (!p.contains(X - i)) {
        		answer = X - i;
        		break;
        	} else if (!p.contains(X + i)) {
        		answer = X + i;
        		break;
        	}
        } {
        	if (!p.contains(X - i)) {
        		answer = X - i;
        		break;
        	} else if (!p.contains(X + i)) {
        		answer = X + i;
        		break;
        	}
        } if (!p.contains(X - i)) {
        		answer = X - i;
        		break;
        	} else if (!p.contains(X + i)) {
        		answer = X + i;
        		break;
        	} !p.contains(X - i) p.contains(X - i) p.contains p X - i X i {
        		answer = X - i;
        		break;
        	} answer = X - i answer X - i X i break; if (!p.contains(X + i)) {
        		answer = X + i;
        		break;
        	} !p.contains(X + i) p.contains(X + i) p.contains p X + i X i {
        		answer = X + i;
        		break;
        	} answer = X + i answer X + i X i break; return answer; answer //出力
    public void show(int answer) {
        System.out.println(answer);
    } show {
        System.out.println(answer);
    } System.out.println(answer) System.out.println System.out System System.out answer int answer answer public class Main {
	public static void main(String[] args) throws Exception {
        Scanner sc = new Scanner(System.in);
        Main m = new Main(sc);
        m.show(m.solve());
        sc.close();
    }
    
	//フィールド
    Scanner sc;
    int X;
    int N;
    List<Integer> p = new ArrayList<Integer>();;
    
    //入力
    Main(Scanner sc) {
        this.sc = sc;
        this.X = sc.nextInt();
        this.N = sc.nextInt();
        for (int i = 0; i< N; i++) {
        	p.add(sc.nextInt());
        }
    }
    
    //解答処理
    private int solve() {
        int answer = 0;
        
        for (int i = 0; i<= 100; i++) {
        	if (!p.contains(X - i)) {
        		answer = X - i;
        		break;
        	} else if (!p.contains(X + i)) {
        		answer = X + i;
        		break;
        	}
        }
        
        return answer;
    }
    
    //出力
    public void show(int answer) {
        System.out.println(answer);
    }

} public class Main {
	public static void main(String[] args) throws Exception {
        Scanner sc = new Scanner(System.in);
        Main m = new Main(sc);
        m.show(m.solve());
        sc.close();
    }
    
	//フィールド
    Scanner sc;
    int X;
    int N;
    List<Integer> p = new ArrayList<Integer>();;
    
    //入力
    Main(Scanner sc) {
        this.sc = sc;
        this.X = sc.nextInt();
        this.N = sc.nextInt();
        for (int i = 0; i< N; i++) {
        	p.add(sc.nextInt());
        }
    }
    
    //解答処理
    private int solve() {
        int answer = 0;
        
        for (int i = 0; i<= 100; i++) {
        	if (!p.contains(X - i)) {
        		answer = X - i;
        		break;
        	} else if (!p.contains(X + i)) {
        		answer = X + i;
        		break;
        	}
        }
        
        return answer;
    }
    
    //出力
    public void show(int answer) {
        System.out.println(answer);
    }

} Main
import java.util.ArrayList;
import java.util.List;
import java.util.Scanner;

public class Main {
	public static void main(String[] args) throws Exception {
        Scanner sc = new Scanner(System.in);
        Main m = new Main(sc);
        m.show(m.solve());
        sc.close();
    }
    
	//フィールド
    Scanner sc;
    int X;
    int N;
    List<Integer> p = new ArrayList<Integer>();;
    
    //入力
    Main(Scanner sc) {
        this.sc = sc;
        this.X = sc.nextInt();
        this.N = sc.nextInt();
        for (int i = 0; i< N; i++) {
        	p.add(sc.nextInt());
        }
    }
    
    //解答処理
    private int solve() {
        int answer = 0;
        
        for (int i = 0; i<= 100; i++) {
        	if (!p.contains(X - i)) {
        		answer = X - i;
        		break;
        	} else if (!p.contains(X + i)) {
        		answer = X + i;
        		break;
        	}
        }
        
        return answer;
    }
    
    //出力
    public void show(int answer) {
        System.out.println(answer);
    }

}
