import java.io.IOException;
import java.io.InputStream;
import java.util.*;

public class Main {
    public static void main(String[] args) {
        FastScanner scanner = new FastScanner();
        int x = scanner.nextInt();
        int n = scanner.nextInt();
        List<Integer> inputList = new ArrayList<>();
        for (int i = 0; i < n; i++) {
            inputList.add(scanner.nextInt());
        }
        // N = 0 の場合
        if (n == 0) {
            System.out.println(x);
            return;
        }
        int min = 999;
        for (int i = 0; i <= 150; i++) {
            if (!inputList.contains(x - i)) {
                min = x - i;
                break;
            }
            if (!inputList.contains(x + i)) {
                min = x + i;
                break;
            }
        }
        System.out.println(min);
    }
}

class FastScanner {
    private final InputStream in = System.in;
    private final byte[] buffer = new byte[1024];
    private int ptr = 0;
    private int buflen = 0;

    private boolean hasNextByte() {
        if (ptr < buflen) {
            return true;
        } else {
            ptr = 0;
            try {
                buflen = in.read(buffer);
            } catch (IOException e) {
                e.printStackTrace();
            }
            if (buflen <= 0) {
                return false;
            }
        }
        return true;
    }

    private int readByte() {
        if (hasNextByte())
            return buffer[ptr++];
        else
            return -1;
    }

    private static boolean isPrintableChar(int c) {
        return 33 <= c && c <= 126;
    }

    public boolean hasNext() {
        while (hasNextByte() && !isPrintableChar(buffer[ptr]))
            ptr++;
        return hasNextByte();
    }

    public String next() {
        if (!hasNext())
            throw new NoSuchElementException();
        StringBuilder sb = new StringBuilder();
        int b = readByte();
        while (isPrintableChar(b)) {
            sb.appendCodePoint(b);
            b = readByte();
        }
        return sb.toString();
    }

    public long nextLong() {
        if (!hasNext())
            throw new NoSuchElementException();
        long n = 0;
        boolean minus = false;
        int b = readByte();
        if (b == '-') {
            minus = true;
            b = readByte();
        }
        if (b < '0' || '9' < b) {
            throw new NumberFormatException();
        }
        while (true) {
            if ('0' <= b && b <= '9') {
                n *= 10;
                n += b - '0';
            } else if (b == -1 || !isPrintableChar(b)) {
                return minus ? -n : n;
            } else {
                throw new NumberFormatException();
            }
            b = readByte();
        }
    }

    public int nextInt() {
        long nl = nextLong();
        if (nl < Integer.MIN_VALUE || nl > Integer.MAX_VALUE)
            throw new NumberFormatException();
        return (int) nl;
    }

    public double nextDouble() {
        return Double.parseDouble(next());
    }
} import java.io.IOException; IOException java.io import java.io.InputStream; InputStream java.io import java.util.*; util.* java public class Main {
    public static void main(String[] args) {
        FastScanner scanner = new FastScanner();
        int x = scanner.nextInt();
        int n = scanner.nextInt();
        List<Integer> inputList = new ArrayList<>();
        for (int i = 0; i < n; i++) {
            inputList.add(scanner.nextInt());
        }
        // N = 0 の場合
        if (n == 0) {
            System.out.println(x);
            return;
        }
        int min = 999;
        for (int i = 0; i <= 150; i++) {
            if (!inputList.contains(x - i)) {
                min = x - i;
                break;
            }
            if (!inputList.contains(x + i)) {
                min = x + i;
                break;
            }
        }
        System.out.println(min);
    }
} Main public static void main(String[] args) {
        FastScanner scanner = new FastScanner();
        int x = scanner.nextInt();
        int n = scanner.nextInt();
        List<Integer> inputList = new ArrayList<>();
        for (int i = 0; i < n; i++) {
            inputList.add(scanner.nextInt());
        }
        // N = 0 の場合
        if (n == 0) {
            System.out.println(x);
            return;
        }
        int min = 999;
        for (int i = 0; i <= 150; i++) {
            if (!inputList.contains(x - i)) {
                min = x - i;
                break;
            }
            if (!inputList.contains(x + i)) {
                min = x + i;
                break;
            }
        }
        System.out.println(min);
    } main {
        FastScanner scanner = new FastScanner();
        int x = scanner.nextInt();
        int n = scanner.nextInt();
        List<Integer> inputList = new ArrayList<>();
        for (int i = 0; i < n; i++) {
            inputList.add(scanner.nextInt());
        }
        // N = 0 の場合
        if (n == 0) {
            System.out.println(x);
            return;
        }
        int min = 999;
        for (int i = 0; i <= 150; i++) {
            if (!inputList.contains(x - i)) {
                min = x - i;
                break;
            }
            if (!inputList.contains(x + i)) {
                min = x + i;
                break;
            }
        }
        System.out.println(min);
    } FastScanner scanner = new FastScanner(); scanner new FastScanner() int x = scanner.nextInt(); x scanner.nextInt() scanner.nextInt scanner int n = scanner.nextInt(); n scanner.nextInt() scanner.nextInt scanner List<Integer> inputList = new ArrayList<>(); inputList new ArrayList<>() for (int i = 0; i < n; i++) {
            inputList.add(scanner.nextInt());
        } int i = 0; int i = 0; i 0 i < n i n i++ i++ i {
            inputList.add(scanner.nextInt());
        } {
            inputList.add(scanner.nextInt());
        } inputList.add(scanner.nextInt()) inputList.add inputList scanner.nextInt() scanner.nextInt scanner if (n == 0) {
            System.out.println(x);
            return;
        } n == 0 n 0 {
            System.out.println(x);
            return;
        } System.out.println(x) System.out.println System.out System System.out x return; int min = 999; min 999 for (int i = 0; i <= 150; i++) {
            if (!inputList.contains(x - i)) {
                min = x - i;
                break;
            }
            if (!inputList.contains(x + i)) {
                min = x + i;
                break;
            }
        } int i = 0; int i = 0; i 0 i <= 150 i 150 i++ i++ i {
            if (!inputList.contains(x - i)) {
                min = x - i;
                break;
            }
            if (!inputList.contains(x + i)) {
                min = x + i;
                break;
            }
        } {
            if (!inputList.contains(x - i)) {
                min = x - i;
                break;
            }
            if (!inputList.contains(x + i)) {
                min = x + i;
                break;
            }
        } if (!inputList.contains(x - i)) {
                min = x - i;
                break;
            } !inputList.contains(x - i) inputList.contains(x - i) inputList.contains inputList x - i x i {
                min = x - i;
                break;
            } min = x - i min x - i x i break; if (!inputList.contains(x + i)) {
                min = x + i;
                break;
            } !inputList.contains(x + i) inputList.contains(x + i) inputList.contains inputList x + i x i {
                min = x + i;
                break;
            } min = x + i min x + i x i break; System.out.println(min) System.out.println System.out System System.out min String[] args args class FastScanner {
    private final InputStream in = System.in;
    private final byte[] buffer = new byte[1024];
    private int ptr = 0;
    private int buflen = 0;

    private boolean hasNextByte() {
        if (ptr < buflen) {
            return true;
        } else {
            ptr = 0;
            try {
                buflen = in.read(buffer);
            } catch (IOException e) {
                e.printStackTrace();
            }
            if (buflen <= 0) {
                return false;
            }
        }
        return true;
    }

    private int readByte() {
        if (hasNextByte())
            return buffer[ptr++];
        else
            return -1;
    }

    private static boolean isPrintableChar(int c) {
        return 33 <= c && c <= 126;
    }

    public boolean hasNext() {
        while (hasNextByte() && !isPrintableChar(buffer[ptr]))
            ptr++;
        return hasNextByte();
    }

    public String next() {
        if (!hasNext())
            throw new NoSuchElementException();
        StringBuilder sb = new StringBuilder();
        int b = readByte();
        while (isPrintableChar(b)) {
            sb.appendCodePoint(b);
            b = readByte();
        }
        return sb.toString();
    }

    public long nextLong() {
        if (!hasNext())
            throw new NoSuchElementException();
        long n = 0;
        boolean minus = false;
        int b = readByte();
        if (b == '-') {
            minus = true;
            b = readByte();
        }
        if (b < '0' || '9' < b) {
            throw new NumberFormatException();
        }
        while (true) {
            if ('0' <= b && b <= '9') {
                n *= 10;
                n += b - '0';
            } else if (b == -1 || !isPrintableChar(b)) {
                return minus ? -n : n;
            } else {
                throw new NumberFormatException();
            }
            b = readByte();
        }
    }

    public int nextInt() {
        long nl = nextLong();
        if (nl < Integer.MIN_VALUE || nl > Integer.MAX_VALUE)
            throw new NumberFormatException();
        return (int) nl;
    }

    public double nextDouble() {
        return Double.parseDouble(next());
    }
} FastScanner private final InputStream in = System.in; in System.in System System.in private final byte[] buffer = new byte[1024]; buffer new byte[1024] 1024 private int ptr = 0; ptr 0 private int buflen = 0; buflen 0 private boolean hasNextByte() {
        if (ptr < buflen) {
            return true;
        } else {
            ptr = 0;
            try {
                buflen = in.read(buffer);
            } catch (IOException e) {
                e.printStackTrace();
            }
            if (buflen <= 0) {
                return false;
            }
        }
        return true;
    } hasNextByte {
        if (ptr < buflen) {
            return true;
        } else {
            ptr = 0;
            try {
                buflen = in.read(buffer);
            } catch (IOException e) {
                e.printStackTrace();
            }
            if (buflen <= 0) {
                return false;
            }
        }
        return true;
    } if (ptr < buflen) {
            return true;
        } else {
            ptr = 0;
            try {
                buflen = in.read(buffer);
            } catch (IOException e) {
                e.printStackTrace();
            }
            if (buflen <= 0) {
                return false;
            }
        } ptr < buflen ptr buflen {
            return true;
        } return true; true {
            ptr = 0;
            try {
                buflen = in.read(buffer);
            } catch (IOException e) {
                e.printStackTrace();
            }
            if (buflen <= 0) {
                return false;
            }
        } ptr = 0 ptr 0 try {
                buflen = in.read(buffer);
            } catch (IOException e) {
                e.printStackTrace();
            } catch (IOException e) {
                e.printStackTrace();
            } IOException e {
                e.printStackTrace();
            } e.printStackTrace() e.printStackTrace e {
                buflen = in.read(buffer);
            } buflen = in.read(buffer) buflen in.read(buffer) in.read in buffer if (buflen <= 0) {
                return false;
            } buflen <= 0 buflen 0 {
                return false;
            } return false; false return true; true private int readByte() {
        if (hasNextByte())
            return buffer[ptr++];
        else
            return -1;
    } readByte {
        if (hasNextByte())
            return buffer[ptr++];
        else
            return -1;
    } if (hasNextByte())
            return buffer[ptr++];
        else
            return -1; hasNextByte() hasNextByte return buffer[ptr++]; buffer[ptr++] buffer ptr++ ptr return -1; -1 1 private static boolean isPrintableChar(int c) {
        return 33 <= c && c <= 126;
    } isPrintableChar {
        return 33 <= c && c <= 126;
    } return 33 <= c && c <= 126; 33 <= c && c <= 126 33 <= c 33 c c <= 126 c 126 int c c public boolean hasNext() {
        while (hasNextByte() && !isPrintableChar(buffer[ptr]))
            ptr++;
        return hasNextByte();
    } hasNext {
        while (hasNextByte() && !isPrintableChar(buffer[ptr]))
            ptr++;
        return hasNextByte();
    } while (hasNextByte() && !isPrintableChar(buffer[ptr]))
            ptr++; hasNextByte() && !isPrintableChar(buffer[ptr]) hasNextByte() hasNextByte !isPrintableChar(buffer[ptr]) isPrintableChar(buffer[ptr]) isPrintableChar buffer[ptr] buffer ptr ptr++ ptr return hasNextByte(); hasNextByte() hasNextByte public String next() {
        if (!hasNext())
            throw new NoSuchElementException();
        StringBuilder sb = new StringBuilder();
        int b = readByte();
        while (isPrintableChar(b)) {
            sb.appendCodePoint(b);
            b = readByte();
        }
        return sb.toString();
    } next {
        if (!hasNext())
            throw new NoSuchElementException();
        StringBuilder sb = new StringBuilder();
        int b = readByte();
        while (isPrintableChar(b)) {
            sb.appendCodePoint(b);
            b = readByte();
        }
        return sb.toString();
    } if (!hasNext())
            throw new NoSuchElementException(); !hasNext() hasNext() hasNext throw new NoSuchElementException(); new NoSuchElementException() StringBuilder sb = new StringBuilder(); sb new StringBuilder() int b = readByte(); b readByte() readByte while (isPrintableChar(b)) {
            sb.appendCodePoint(b);
            b = readByte();
        } isPrintableChar(b) isPrintableChar b {
            sb.appendCodePoint(b);
            b = readByte();
        } sb.appendCodePoint(b) sb.appendCodePoint sb b b = readByte() b readByte() readByte return sb.toString(); sb.toString() sb.toString sb public long nextLong() {
        if (!hasNext())
            throw new NoSuchElementException();
        long n = 0;
        boolean minus = false;
        int b = readByte();
        if (b == '-') {
            minus = true;
            b = readByte();
        }
        if (b < '0' || '9' < b) {
            throw new NumberFormatException();
        }
        while (true) {
            if ('0' <= b && b <= '9') {
                n *= 10;
                n += b - '0';
            } else if (b == -1 || !isPrintableChar(b)) {
                return minus ? -n : n;
            } else {
                throw new NumberFormatException();
            }
            b = readByte();
        }
    } nextLong {
        if (!hasNext())
            throw new NoSuchElementException();
        long n = 0;
        boolean minus = false;
        int b = readByte();
        if (b == '-') {
            minus = true;
            b = readByte();
        }
        if (b < '0' || '9' < b) {
            throw new NumberFormatException();
        }
        while (true) {
            if ('0' <= b && b <= '9') {
                n *= 10;
                n += b - '0';
            } else if (b == -1 || !isPrintableChar(b)) {
                return minus ? -n : n;
            } else {
                throw new NumberFormatException();
            }
            b = readByte();
        }
    } if (!hasNext())
            throw new NoSuchElementException(); !hasNext() hasNext() hasNext throw new NoSuchElementException(); new NoSuchElementException() long n = 0; n 0 boolean minus = false; minus false int b = readByte(); b readByte() readByte if (b == '-') {
            minus = true;
            b = readByte();
        } b == '-' b '-' {
            minus = true;
            b = readByte();
        } minus = true minus true b = readByte() b readByte() readByte if (b < '0' || '9' < b) {
            throw new NumberFormatException();
        } b < '0' || '9' < b b < '0' b '0' '9' < b '9' b {
            throw new NumberFormatException();
        } throw new NumberFormatException(); new NumberFormatException() while (true) {
            if ('0' <= b && b <= '9') {
                n *= 10;
                n += b - '0';
            } else if (b == -1 || !isPrintableChar(b)) {
                return minus ? -n : n;
            } else {
                throw new NumberFormatException();
            }
            b = readByte();
        } true {
            if ('0' <= b && b <= '9') {
                n *= 10;
                n += b - '0';
            } else if (b == -1 || !isPrintableChar(b)) {
                return minus ? -n : n;
            } else {
                throw new NumberFormatException();
            }
            b = readByte();
        } if ('0' <= b && b <= '9') {
                n *= 10;
                n += b - '0';
            } else if (b == -1 || !isPrintableChar(b)) {
                return minus ? -n : n;
            } else {
                throw new NumberFormatException();
            } '0' <= b && b <= '9' '0' <= b '0' b b <= '9' b '9' {
                n *= 10;
                n += b - '0';
            } n *= 10 n 10 n += b - '0' n b - '0' b '0' if (b == -1 || !isPrintableChar(b)) {
                return minus ? -n : n;
            } else {
                throw new NumberFormatException();
            } b == -1 || !isPrintableChar(b) b == -1 b -1 1 !isPrintableChar(b) isPrintableChar(b) isPrintableChar b {
                return minus ? -n : n;
            } return minus ? -n : n; minus ? -n : n minus -n n n {
                throw new NumberFormatException();
            } throw new NumberFormatException(); new NumberFormatException() b = readByte() b readByte() readByte public int nextInt() {
        long nl = nextLong();
        if (nl < Integer.MIN_VALUE || nl > Integer.MAX_VALUE)
            throw new NumberFormatException();
        return (int) nl;
    } nextInt {
        long nl = nextLong();
        if (nl < Integer.MIN_VALUE || nl > Integer.MAX_VALUE)
            throw new NumberFormatException();
        return (int) nl;
    } long nl = nextLong(); nl nextLong() nextLong if (nl < Integer.MIN_VALUE || nl > Integer.MAX_VALUE)
            throw new NumberFormatException(); nl < Integer.MIN_VALUE || nl > Integer.MAX_VALUE nl < Integer.MIN_VALUE nl Integer.MIN_VALUE Integer Integer.MIN_VALUE nl > Integer.MAX_VALUE nl Integer.MAX_VALUE Integer Integer.MAX_VALUE throw new NumberFormatException(); new NumberFormatException() return (int) nl; (int) nl public double nextDouble() {
        return Double.parseDouble(next());
    } nextDouble {
        return Double.parseDouble(next());
    } return Double.parseDouble(next()); Double.parseDouble(next()) Double.parseDouble Double next() next public class Main {
    public static void main(String[] args) {
        FastScanner scanner = new FastScanner();
        int x = scanner.nextInt();
        int n = scanner.nextInt();
        List<Integer> inputList = new ArrayList<>();
        for (int i = 0; i < n; i++) {
            inputList.add(scanner.nextInt());
        }
        // N = 0 の場合
        if (n == 0) {
            System.out.println(x);
            return;
        }
        int min = 999;
        for (int i = 0; i <= 150; i++) {
            if (!inputList.contains(x - i)) {
                min = x - i;
                break;
            }
            if (!inputList.contains(x + i)) {
                min = x + i;
                break;
            }
        }
        System.out.println(min);
    }
} public class Main {
    public static void main(String[] args) {
        FastScanner scanner = new FastScanner();
        int x = scanner.nextInt();
        int n = scanner.nextInt();
        List<Integer> inputList = new ArrayList<>();
        for (int i = 0; i < n; i++) {
            inputList.add(scanner.nextInt());
        }
        // N = 0 の場合
        if (n == 0) {
            System.out.println(x);
            return;
        }
        int min = 999;
        for (int i = 0; i <= 150; i++) {
            if (!inputList.contains(x - i)) {
                min = x - i;
                break;
            }
            if (!inputList.contains(x + i)) {
                min = x + i;
                break;
            }
        }
        System.out.println(min);
    }
} Main
import java.io.IOException;
import java.io.InputStream;
import java.util.*;

public class Main {
    public static void main(String[] args) {
        FastScanner scanner = new FastScanner();
        int x = scanner.nextInt();
        int n = scanner.nextInt();
        List<Integer> inputList = new ArrayList<>();
        for (int i = 0; i < n; i++) {
            inputList.add(scanner.nextInt());
        }
        // N = 0 の場合
        if (n == 0) {
            System.out.println(x);
            return;
        }
        int min = 999;
        for (int i = 0; i <= 150; i++) {
            if (!inputList.contains(x - i)) {
                min = x - i;
                break;
            }
            if (!inputList.contains(x + i)) {
                min = x + i;
                break;
            }
        }
        System.out.println(min);
    }
}

class FastScanner {
    private final InputStream in = System.in;
    private final byte[] buffer = new byte[1024];
    private int ptr = 0;
    private int buflen = 0;

    private boolean hasNextByte() {
        if (ptr < buflen) {
            return true;
        } else {
            ptr = 0;
            try {
                buflen = in.read(buffer);
            } catch (IOException e) {
                e.printStackTrace();
            }
            if (buflen <= 0) {
                return false;
            }
        }
        return true;
    }

    private int readByte() {
        if (hasNextByte())
            return buffer[ptr++];
        else
            return -1;
    }

    private static boolean isPrintableChar(int c) {
        return 33 <= c && c <= 126;
    }

    public boolean hasNext() {
        while (hasNextByte() && !isPrintableChar(buffer[ptr]))
            ptr++;
        return hasNextByte();
    }

    public String next() {
        if (!hasNext())
            throw new NoSuchElementException();
        StringBuilder sb = new StringBuilder();
        int b = readByte();
        while (isPrintableChar(b)) {
            sb.appendCodePoint(b);
            b = readByte();
        }
        return sb.toString();
    }

    public long nextLong() {
        if (!hasNext())
            throw new NoSuchElementException();
        long n = 0;
        boolean minus = false;
        int b = readByte();
        if (b == '-') {
            minus = true;
            b = readByte();
        }
        if (b < '0' || '9' < b) {
            throw new NumberFormatException();
        }
        while (true) {
            if ('0' <= b && b <= '9') {
                n *= 10;
                n += b - '0';
            } else if (b == -1 || !isPrintableChar(b)) {
                return minus ? -n : n;
            } else {
                throw new NumberFormatException();
            }
            b = readByte();
        }
    }

    public int nextInt() {
        long nl = nextLong();
        if (nl < Integer.MIN_VALUE || nl > Integer.MAX_VALUE)
            throw new NumberFormatException();
        return (int) nl;
    }

    public double nextDouble() {
        return Double.parseDouble(next());
    }
}