import java.io.*;
import java.util.*;

public class Main {
    public static void main(String[] args) {
        FastScanner fs = new FastScanner();

        int x = (int)fs.nextLong();
        int n = (int)fs.nextLong();
        int ans=x;

        // int[] p=new int[n];
        // p=Arrays.fill(p, (int)fs.next());

        ArrayList<Integer> p = new ArrayList<Integer> ();
        for (int i = 0; i < n; i++) p.add((int) fs.nextLong());

        for (int i = 0;; i++) {
            if(!p.contains(ans-i) || !p.contains(ans+i)) {
                System.out.println((!p.contains(ans-i)) ? ans-i : ans+i);
                break;
            }
        }
    }
}

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 (final 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(final int c) {
        return 33 <= c && c <= 126;
    }

    private void skipUnprintable() {
        while (hasNextByte() && !isPrintableChar(buffer[ptr]))
            ptr++;
    }

    public boolean hasNext() {
        skipUnprintable();
        return hasNextByte();
    }

    public String next() {
        if (!hasNext())
            throw new NoSuchElementException();
        final 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();
        }
    }
} import java.io.*; io.* java import java.util.*; util.* java public class Main {
    public static void main(String[] args) {
        FastScanner fs = new FastScanner();

        int x = (int)fs.nextLong();
        int n = (int)fs.nextLong();
        int ans=x;

        // int[] p=new int[n];
        // p=Arrays.fill(p, (int)fs.next());

        ArrayList<Integer> p = new ArrayList<Integer> ();
        for (int i = 0; i < n; i++) p.add((int) fs.nextLong());

        for (int i = 0;; i++) {
            if(!p.contains(ans-i) || !p.contains(ans+i)) {
                System.out.println((!p.contains(ans-i)) ? ans-i : ans+i);
                break;
            }
        }
    }
} Main public static void main(String[] args) {
        FastScanner fs = new FastScanner();

        int x = (int)fs.nextLong();
        int n = (int)fs.nextLong();
        int ans=x;

        // int[] p=new int[n];
        // p=Arrays.fill(p, (int)fs.next());

        ArrayList<Integer> p = new ArrayList<Integer> ();
        for (int i = 0; i < n; i++) p.add((int) fs.nextLong());

        for (int i = 0;; i++) {
            if(!p.contains(ans-i) || !p.contains(ans+i)) {
                System.out.println((!p.contains(ans-i)) ? ans-i : ans+i);
                break;
            }
        }
    } main {
        FastScanner fs = new FastScanner();

        int x = (int)fs.nextLong();
        int n = (int)fs.nextLong();
        int ans=x;

        // int[] p=new int[n];
        // p=Arrays.fill(p, (int)fs.next());

        ArrayList<Integer> p = new ArrayList<Integer> ();
        for (int i = 0; i < n; i++) p.add((int) fs.nextLong());

        for (int i = 0;; i++) {
            if(!p.contains(ans-i) || !p.contains(ans+i)) {
                System.out.println((!p.contains(ans-i)) ? ans-i : ans+i);
                break;
            }
        }
    } FastScanner fs = new FastScanner(); fs new FastScanner() int x = (int)fs.nextLong(); x (int)fs.nextLong() fs.nextLong fs int n = (int)fs.nextLong(); n (int)fs.nextLong() fs.nextLong fs int ans=x; ans x ArrayList<Integer> p = new ArrayList<Integer> (); p new ArrayList<Integer> () for (int i = 0; i < n; i++) p.add((int) fs.nextLong()); int i = 0; int i = 0; i 0 i < n i n i++ i++ i p.add((int) fs.nextLong()); p.add((int) fs.nextLong()) p.add p (int) fs.nextLong() fs.nextLong fs for (int i = 0;; i++) {
            if(!p.contains(ans-i) || !p.contains(ans+i)) {
                System.out.println((!p.contains(ans-i)) ? ans-i : ans+i);
                break;
            }
        } int i = 0; int i = 0; i 0 i++ i++ i {
            if(!p.contains(ans-i) || !p.contains(ans+i)) {
                System.out.println((!p.contains(ans-i)) ? ans-i : ans+i);
                break;
            }
        } {
            if(!p.contains(ans-i) || !p.contains(ans+i)) {
                System.out.println((!p.contains(ans-i)) ? ans-i : ans+i);
                break;
            }
        } if(!p.contains(ans-i) || !p.contains(ans+i)) {
                System.out.println((!p.contains(ans-i)) ? ans-i : ans+i);
                break;
            } !p.contains(ans-i) || !p.contains(ans+i) !p.contains(ans-i) p.contains(ans-i) p.contains p ans-i ans i !p.contains(ans+i) p.contains(ans+i) p.contains p ans+i ans i {
                System.out.println((!p.contains(ans-i)) ? ans-i : ans+i);
                break;
            } System.out.println((!p.contains(ans-i)) ? ans-i : ans+i) System.out.println System.out System System.out (!p.contains(ans-i)) ? ans-i : ans+i (!p.contains(ans-i)) p.contains(ans-i) p.contains p ans-i ans i ans-i ans i ans+i ans i break; 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 (final 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(final int c) {
        return 33 <= c && c <= 126;
    }

    private void skipUnprintable() {
        while (hasNextByte() && !isPrintableChar(buffer[ptr]))
            ptr++;
    }

    public boolean hasNext() {
        skipUnprintable();
        return hasNextByte();
    }

    public String next() {
        if (!hasNext())
            throw new NoSuchElementException();
        final 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();
        }
    }
} 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 (final 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 (final IOException e) {
            e.printStackTrace();
        }
        if (buflen <= 0)
            return false;
        return true;
    } if (ptr < buflen)
            return true;
        else
            ptr = 0; ptr < buflen ptr buflen return true; true ptr = 0 ptr 0 try {
            buflen = in.read(buffer);
        } catch (final IOException e) {
            e.printStackTrace();
        } catch (final IOException e) {
            e.printStackTrace();
        } final 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; 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(final 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 final int c c private void skipUnprintable() {
        while (hasNextByte() && !isPrintableChar(buffer[ptr]))
            ptr++;
    } skipUnprintable {
        while (hasNextByte() && !isPrintableChar(buffer[ptr]))
            ptr++;
    } 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 public boolean hasNext() {
        skipUnprintable();
        return hasNextByte();
    } hasNext {
        skipUnprintable();
        return hasNextByte();
    } skipUnprintable() skipUnprintable return hasNextByte(); hasNextByte() hasNextByte public String next() {
        if (!hasNext())
            throw new NoSuchElementException();
        final StringBuilder sb = new StringBuilder();
        int b = readByte();
        while (isPrintableChar(b)) {
            sb.appendCodePoint(b);
            b = readByte();
        }
        return sb.toString();
    } next {
        if (!hasNext())
            throw new NoSuchElementException();
        final 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() final 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(); 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; minus ? -n : n minus -n n n throw new NumberFormatException(); new NumberFormatException() b = readByte() b readByte() readByte public class Main {
    public static void main(String[] args) {
        FastScanner fs = new FastScanner();

        int x = (int)fs.nextLong();
        int n = (int)fs.nextLong();
        int ans=x;

        // int[] p=new int[n];
        // p=Arrays.fill(p, (int)fs.next());

        ArrayList<Integer> p = new ArrayList<Integer> ();
        for (int i = 0; i < n; i++) p.add((int) fs.nextLong());

        for (int i = 0;; i++) {
            if(!p.contains(ans-i) || !p.contains(ans+i)) {
                System.out.println((!p.contains(ans-i)) ? ans-i : ans+i);
                break;
            }
        }
    }
} public class Main {
    public static void main(String[] args) {
        FastScanner fs = new FastScanner();

        int x = (int)fs.nextLong();
        int n = (int)fs.nextLong();
        int ans=x;

        // int[] p=new int[n];
        // p=Arrays.fill(p, (int)fs.next());

        ArrayList<Integer> p = new ArrayList<Integer> ();
        for (int i = 0; i < n; i++) p.add((int) fs.nextLong());

        for (int i = 0;; i++) {
            if(!p.contains(ans-i) || !p.contains(ans+i)) {
                System.out.println((!p.contains(ans-i)) ? ans-i : ans+i);
                break;
            }
        }
    }
} Main
import java.io.*;
import java.util.*;

public class Main {
    public static void main(String[] args) {
        FastScanner fs = new FastScanner();

        int x = (int)fs.nextLong();
        int n = (int)fs.nextLong();
        int ans=x;

        // int[] p=new int[n];
        // p=Arrays.fill(p, (int)fs.next());

        ArrayList<Integer> p = new ArrayList<Integer> ();
        for (int i = 0; i < n; i++) p.add((int) fs.nextLong());

        for (int i = 0;; i++) {
            if(!p.contains(ans-i) || !p.contains(ans+i)) {
                System.out.println((!p.contains(ans-i)) ? ans-i : ans+i);
                break;
            }
        }
    }
}

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 (final 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(final int c) {
        return 33 <= c && c <= 126;
    }

    private void skipUnprintable() {
        while (hasNextByte() && !isPrintableChar(buffer[ptr]))
            ptr++;
    }

    public boolean hasNext() {
        skipUnprintable();
        return hasNextByte();
    }

    public String next() {
        if (!hasNext())
            throw new NoSuchElementException();
        final 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();
        }
    }
}