import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.io.PrintWriter;

/**
 * Built using CHelper plug-in
 * Actual solution is at the top
 *
 * @author Spandan Mishra
 */
public class Main {
    public static void main(String[] args) {
        InputStream inputStream = System.in;
        OutputStream outputStream = System.out;
        InputReader in = new InputReader(inputStream);
        PrintWriter out = new PrintWriter(outputStream);
        CForbiddenList solver = new CForbiddenList();
        solver.solve(1, in, out);
        out.close();
    }

    static class CForbiddenList {
        public void solve(int testNumber, InputReader in, PrintWriter out) {
            int x = in.readInt();
            int n = in.readInt();
            boolean[] a = new boolean[201];

            for (int i = 0; i < n; i++)
                a[in.readInt()] = true;

            int min = Integer.MAX_VALUE;
            int ans = 0;
            for (int i = -100; i <= 200; i++) {
                if (i >= 0 && a[i])
                    continue;

                if (min > Math.abs(x - i)) {
                    min = Math.abs(x - i);
                    ans = i;
                }

            }

            System.out.println(ans);
        }

    }

    static class InputReader {
        private InputStream stream;
        private byte[] buf = new byte[1024];
        private int curChar;
        private int numChars;

        public InputReader(InputStream stream) {
            this.stream = stream;
        }

        public int read() {
            if (numChars == -1)
                throw new RuntimeException();
            if (curChar >= numChars) {
                curChar = 0;
                try {
                    numChars = stream.read(buf);
                } catch (IOException e) {
                    throw new RuntimeException();
                }
                if (numChars <= 0)
                    return -1;
            }
            return buf[curChar++];
        }

        public int readInt() {
            int c = read();
            while (isSpaceChar(c))
                c = read();
            int sgn = 1;
            if (c == '-') {
                sgn = -1;
                c = read();
            }
            int res = 0;
            do {
                res *= 10;
                res += c - '0';
                c = read();
            } while (!isSpaceChar(c));
            return res * sgn;
        }

        public boolean isSpaceChar(int c) {
            return c == ' ' || c == '\n' || c == '\r' || c == '\t' || c == -1;
        }

    }
}
 import java.io.IOException; IOException java.io import java.io.InputStream; InputStream java.io import java.io.OutputStream; OutputStream java.io import java.io.PrintWriter; PrintWriter java.io public class Main {
    public static void main(String[] args) {
        InputStream inputStream = System.in;
        OutputStream outputStream = System.out;
        InputReader in = new InputReader(inputStream);
        PrintWriter out = new PrintWriter(outputStream);
        CForbiddenList solver = new CForbiddenList();
        solver.solve(1, in, out);
        out.close();
    }

    static class CForbiddenList {
        public void solve(int testNumber, InputReader in, PrintWriter out) {
            int x = in.readInt();
            int n = in.readInt();
            boolean[] a = new boolean[201];

            for (int i = 0; i < n; i++)
                a[in.readInt()] = true;

            int min = Integer.MAX_VALUE;
            int ans = 0;
            for (int i = -100; i <= 200; i++) {
                if (i >= 0 && a[i])
                    continue;

                if (min > Math.abs(x - i)) {
                    min = Math.abs(x - i);
                    ans = i;
                }

            }

            System.out.println(ans);
        }

    }

    static class InputReader {
        private InputStream stream;
        private byte[] buf = new byte[1024];
        private int curChar;
        private int numChars;

        public InputReader(InputStream stream) {
            this.stream = stream;
        }

        public int read() {
            if (numChars == -1)
                throw new RuntimeException();
            if (curChar >= numChars) {
                curChar = 0;
                try {
                    numChars = stream.read(buf);
                } catch (IOException e) {
                    throw new RuntimeException();
                }
                if (numChars <= 0)
                    return -1;
            }
            return buf[curChar++];
        }

        public int readInt() {
            int c = read();
            while (isSpaceChar(c))
                c = read();
            int sgn = 1;
            if (c == '-') {
                sgn = -1;
                c = read();
            }
            int res = 0;
            do {
                res *= 10;
                res += c - '0';
                c = read();
            } while (!isSpaceChar(c));
            return res * sgn;
        }

        public boolean isSpaceChar(int c) {
            return c == ' ' || c == '\n' || c == '\r' || c == '\t' || c == -1;
        }

    }
} Main public static void main(String[] args) {
        InputStream inputStream = System.in;
        OutputStream outputStream = System.out;
        InputReader in = new InputReader(inputStream);
        PrintWriter out = new PrintWriter(outputStream);
        CForbiddenList solver = new CForbiddenList();
        solver.solve(1, in, out);
        out.close();
    } main {
        InputStream inputStream = System.in;
        OutputStream outputStream = System.out;
        InputReader in = new InputReader(inputStream);
        PrintWriter out = new PrintWriter(outputStream);
        CForbiddenList solver = new CForbiddenList();
        solver.solve(1, in, out);
        out.close();
    } InputStream inputStream = System.in; inputStream System.in System System.in OutputStream outputStream = System.out; outputStream System.out System System.out InputReader in = new InputReader(inputStream); in new InputReader(inputStream) PrintWriter out = new PrintWriter(outputStream); out new PrintWriter(outputStream) CForbiddenList solver = new CForbiddenList(); solver new CForbiddenList() solver.solve(1, in, out) solver.solve solver 1 in out out.close() out.close out String[] args args static class CForbiddenList {
        public void solve(int testNumber, InputReader in, PrintWriter out) {
            int x = in.readInt();
            int n = in.readInt();
            boolean[] a = new boolean[201];

            for (int i = 0; i < n; i++)
                a[in.readInt()] = true;

            int min = Integer.MAX_VALUE;
            int ans = 0;
            for (int i = -100; i <= 200; i++) {
                if (i >= 0 && a[i])
                    continue;

                if (min > Math.abs(x - i)) {
                    min = Math.abs(x - i);
                    ans = i;
                }

            }

            System.out.println(ans);
        }

    } CForbiddenList public void solve(int testNumber, InputReader in, PrintWriter out) {
            int x = in.readInt();
            int n = in.readInt();
            boolean[] a = new boolean[201];

            for (int i = 0; i < n; i++)
                a[in.readInt()] = true;

            int min = Integer.MAX_VALUE;
            int ans = 0;
            for (int i = -100; i <= 200; i++) {
                if (i >= 0 && a[i])
                    continue;

                if (min > Math.abs(x - i)) {
                    min = Math.abs(x - i);
                    ans = i;
                }

            }

            System.out.println(ans);
        } solve {
            int x = in.readInt();
            int n = in.readInt();
            boolean[] a = new boolean[201];

            for (int i = 0; i < n; i++)
                a[in.readInt()] = true;

            int min = Integer.MAX_VALUE;
            int ans = 0;
            for (int i = -100; i <= 200; i++) {
                if (i >= 0 && a[i])
                    continue;

                if (min > Math.abs(x - i)) {
                    min = Math.abs(x - i);
                    ans = i;
                }

            }

            System.out.println(ans);
        } int x = in.readInt(); x in.readInt() in.readInt in int n = in.readInt(); n in.readInt() in.readInt in boolean[] a = new boolean[201]; a new boolean[201] 201 for (int i = 0; i < n; i++)
                a[in.readInt()] = true; int i = 0; int i = 0; i 0 i < n i n i++ i++ i a[in.readInt()] = true; a[in.readInt()] = true a[in.readInt()] a in.readInt() in.readInt in true int min = Integer.MAX_VALUE; min Integer.MAX_VALUE Integer Integer.MAX_VALUE int ans = 0; ans 0 for (int i = -100; i <= 200; i++) {
                if (i >= 0 && a[i])
                    continue;

                if (min > Math.abs(x - i)) {
                    min = Math.abs(x - i);
                    ans = i;
                }

            } int i = -100; int i = -100; i -100 100 i <= 200 i 200 i++ i++ i {
                if (i >= 0 && a[i])
                    continue;

                if (min > Math.abs(x - i)) {
                    min = Math.abs(x - i);
                    ans = i;
                }

            } {
                if (i >= 0 && a[i])
                    continue;

                if (min > Math.abs(x - i)) {
                    min = Math.abs(x - i);
                    ans = i;
                }

            } if (i >= 0 && a[i])
                    continue; i >= 0 && a[i] i >= 0 i 0 a[i] a i continue; if (min > Math.abs(x - i)) {
                    min = Math.abs(x - i);
                    ans = i;
                } min > Math.abs(x - i) min Math.abs(x - i) Math.abs Math x - i x i {
                    min = Math.abs(x - i);
                    ans = i;
                } min = Math.abs(x - i) min Math.abs(x - i) Math.abs Math x - i x i ans = i ans i System.out.println(ans) System.out.println System.out System System.out ans int testNumber testNumber InputReader in in PrintWriter out out static class InputReader {
        private InputStream stream;
        private byte[] buf = new byte[1024];
        private int curChar;
        private int numChars;

        public InputReader(InputStream stream) {
            this.stream = stream;
        }

        public int read() {
            if (numChars == -1)
                throw new RuntimeException();
            if (curChar >= numChars) {
                curChar = 0;
                try {
                    numChars = stream.read(buf);
                } catch (IOException e) {
                    throw new RuntimeException();
                }
                if (numChars <= 0)
                    return -1;
            }
            return buf[curChar++];
        }

        public int readInt() {
            int c = read();
            while (isSpaceChar(c))
                c = read();
            int sgn = 1;
            if (c == '-') {
                sgn = -1;
                c = read();
            }
            int res = 0;
            do {
                res *= 10;
                res += c - '0';
                c = read();
            } while (!isSpaceChar(c));
            return res * sgn;
        }

        public boolean isSpaceChar(int c) {
            return c == ' ' || c == '\n' || c == '\r' || c == '\t' || c == -1;
        }

    } InputReader private InputStream stream; stream private byte[] buf = new byte[1024]; buf new byte[1024] 1024 private int curChar; curChar private int numChars; numChars public InputReader(InputStream stream) {
            this.stream = stream;
        } InputReader {
            this.stream = stream;
        } this.stream = stream this.stream this this.stream stream InputStream stream stream public int read() {
            if (numChars == -1)
                throw new RuntimeException();
            if (curChar >= numChars) {
                curChar = 0;
                try {
                    numChars = stream.read(buf);
                } catch (IOException e) {
                    throw new RuntimeException();
                }
                if (numChars <= 0)
                    return -1;
            }
            return buf[curChar++];
        } read {
            if (numChars == -1)
                throw new RuntimeException();
            if (curChar >= numChars) {
                curChar = 0;
                try {
                    numChars = stream.read(buf);
                } catch (IOException e) {
                    throw new RuntimeException();
                }
                if (numChars <= 0)
                    return -1;
            }
            return buf[curChar++];
        } if (numChars == -1)
                throw new RuntimeException(); numChars == -1 numChars -1 1 throw new RuntimeException(); new RuntimeException() if (curChar >= numChars) {
                curChar = 0;
                try {
                    numChars = stream.read(buf);
                } catch (IOException e) {
                    throw new RuntimeException();
                }
                if (numChars <= 0)
                    return -1;
            } curChar >= numChars curChar numChars {
                curChar = 0;
                try {
                    numChars = stream.read(buf);
                } catch (IOException e) {
                    throw new RuntimeException();
                }
                if (numChars <= 0)
                    return -1;
            } curChar = 0 curChar 0 try {
                    numChars = stream.read(buf);
                } catch (IOException e) {
                    throw new RuntimeException();
                } catch (IOException e) {
                    throw new RuntimeException();
                } IOException e {
                    throw new RuntimeException();
                } throw new RuntimeException(); new RuntimeException() {
                    numChars = stream.read(buf);
                } numChars = stream.read(buf) numChars stream.read(buf) stream.read stream buf if (numChars <= 0)
                    return -1; numChars <= 0 numChars 0 return -1; -1 1 return buf[curChar++]; buf[curChar++] buf curChar++ curChar public int readInt() {
            int c = read();
            while (isSpaceChar(c))
                c = read();
            int sgn = 1;
            if (c == '-') {
                sgn = -1;
                c = read();
            }
            int res = 0;
            do {
                res *= 10;
                res += c - '0';
                c = read();
            } while (!isSpaceChar(c));
            return res * sgn;
        } readInt {
            int c = read();
            while (isSpaceChar(c))
                c = read();
            int sgn = 1;
            if (c == '-') {
                sgn = -1;
                c = read();
            }
            int res = 0;
            do {
                res *= 10;
                res += c - '0';
                c = read();
            } while (!isSpaceChar(c));
            return res * sgn;
        } int c = read(); c read() read while (isSpaceChar(c))
                c = read(); isSpaceChar(c) isSpaceChar c c = read() c read() read int sgn = 1; sgn 1 if (c == '-') {
                sgn = -1;
                c = read();
            } c == '-' c '-' {
                sgn = -1;
                c = read();
            } sgn = -1 sgn -1 1 c = read() c read() read int res = 0; res 0 do {
                res *= 10;
                res += c - '0';
                c = read();
            } while (!isSpaceChar(c)); !isSpaceChar(c) isSpaceChar(c) isSpaceChar c {
                res *= 10;
                res += c - '0';
                c = read();
            } res *= 10 res 10 res += c - '0' res c - '0' c '0' c = read() c read() read return res * sgn; res * sgn res sgn public boolean isSpaceChar(int c) {
            return c == ' ' || c == '\n' || c == '\r' || c == '\t' || c == -1;
        } isSpaceChar {
            return c == ' ' || c == '\n' || c == '\r' || c == '\t' || c == -1;
        } return c == ' ' || c == '\n' || c == '\r' || c == '\t' || c == -1; c == ' ' || c == '\n' || c == '\r' || c == '\t' || c == -1 c == '\t' c == '\r' c == ' ' || c == '\n' || c == '\r' || c == '\t' || c == -1 c == ' ' c ' ' c == '\n' c '\n' c == '\r' c '\r' c == '\t' c '\t' c == -1 c -1 1 int c c public class Main {
    public static void main(String[] args) {
        InputStream inputStream = System.in;
        OutputStream outputStream = System.out;
        InputReader in = new InputReader(inputStream);
        PrintWriter out = new PrintWriter(outputStream);
        CForbiddenList solver = new CForbiddenList();
        solver.solve(1, in, out);
        out.close();
    }

    static class CForbiddenList {
        public void solve(int testNumber, InputReader in, PrintWriter out) {
            int x = in.readInt();
            int n = in.readInt();
            boolean[] a = new boolean[201];

            for (int i = 0; i < n; i++)
                a[in.readInt()] = true;

            int min = Integer.MAX_VALUE;
            int ans = 0;
            for (int i = -100; i <= 200; i++) {
                if (i >= 0 && a[i])
                    continue;

                if (min > Math.abs(x - i)) {
                    min = Math.abs(x - i);
                    ans = i;
                }

            }

            System.out.println(ans);
        }

    }

    static class InputReader {
        private InputStream stream;
        private byte[] buf = new byte[1024];
        private int curChar;
        private int numChars;

        public InputReader(InputStream stream) {
            this.stream = stream;
        }

        public int read() {
            if (numChars == -1)
                throw new RuntimeException();
            if (curChar >= numChars) {
                curChar = 0;
                try {
                    numChars = stream.read(buf);
                } catch (IOException e) {
                    throw new RuntimeException();
                }
                if (numChars <= 0)
                    return -1;
            }
            return buf[curChar++];
        }

        public int readInt() {
            int c = read();
            while (isSpaceChar(c))
                c = read();
            int sgn = 1;
            if (c == '-') {
                sgn = -1;
                c = read();
            }
            int res = 0;
            do {
                res *= 10;
                res += c - '0';
                c = read();
            } while (!isSpaceChar(c));
            return res * sgn;
        }

        public boolean isSpaceChar(int c) {
            return c == ' ' || c == '\n' || c == '\r' || c == '\t' || c == -1;
        }

    }
} public class Main {
    public static void main(String[] args) {
        InputStream inputStream = System.in;
        OutputStream outputStream = System.out;
        InputReader in = new InputReader(inputStream);
        PrintWriter out = new PrintWriter(outputStream);
        CForbiddenList solver = new CForbiddenList();
        solver.solve(1, in, out);
        out.close();
    }

    static class CForbiddenList {
        public void solve(int testNumber, InputReader in, PrintWriter out) {
            int x = in.readInt();
            int n = in.readInt();
            boolean[] a = new boolean[201];

            for (int i = 0; i < n; i++)
                a[in.readInt()] = true;

            int min = Integer.MAX_VALUE;
            int ans = 0;
            for (int i = -100; i <= 200; i++) {
                if (i >= 0 && a[i])
                    continue;

                if (min > Math.abs(x - i)) {
                    min = Math.abs(x - i);
                    ans = i;
                }

            }

            System.out.println(ans);
        }

    }

    static class InputReader {
        private InputStream stream;
        private byte[] buf = new byte[1024];
        private int curChar;
        private int numChars;

        public InputReader(InputStream stream) {
            this.stream = stream;
        }

        public int read() {
            if (numChars == -1)
                throw new RuntimeException();
            if (curChar >= numChars) {
                curChar = 0;
                try {
                    numChars = stream.read(buf);
                } catch (IOException e) {
                    throw new RuntimeException();
                }
                if (numChars <= 0)
                    return -1;
            }
            return buf[curChar++];
        }

        public int readInt() {
            int c = read();
            while (isSpaceChar(c))
                c = read();
            int sgn = 1;
            if (c == '-') {
                sgn = -1;
                c = read();
            }
            int res = 0;
            do {
                res *= 10;
                res += c - '0';
                c = read();
            } while (!isSpaceChar(c));
            return res * sgn;
        }

        public boolean isSpaceChar(int c) {
            return c == ' ' || c == '\n' || c == '\r' || c == '\t' || c == -1;
        }

    }
} Main
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.io.PrintWriter;

/**
 * Built using CHelper plug-in
 * Actual solution is at the top
 *
 * @author Spandan Mishra
 */
public class Main {
    public static void main(String[] args) {
        InputStream inputStream = System.in;
        OutputStream outputStream = System.out;
        InputReader in = new InputReader(inputStream);
        PrintWriter out = new PrintWriter(outputStream);
        CForbiddenList solver = new CForbiddenList();
        solver.solve(1, in, out);
        out.close();
    }

    static class CForbiddenList {
        public void solve(int testNumber, InputReader in, PrintWriter out) {
            int x = in.readInt();
            int n = in.readInt();
            boolean[] a = new boolean[201];

            for (int i = 0; i < n; i++)
                a[in.readInt()] = true;

            int min = Integer.MAX_VALUE;
            int ans = 0;
            for (int i = -100; i <= 200; i++) {
                if (i >= 0 && a[i])
                    continue;

                if (min > Math.abs(x - i)) {
                    min = Math.abs(x - i);
                    ans = i;
                }

            }

            System.out.println(ans);
        }

    }

    static class InputReader {
        private InputStream stream;
        private byte[] buf = new byte[1024];
        private int curChar;
        private int numChars;

        public InputReader(InputStream stream) {
            this.stream = stream;
        }

        public int read() {
            if (numChars == -1)
                throw new RuntimeException();
            if (curChar >= numChars) {
                curChar = 0;
                try {
                    numChars = stream.read(buf);
                } catch (IOException e) {
                    throw new RuntimeException();
                }
                if (numChars <= 0)
                    return -1;
            }
            return buf[curChar++];
        }

        public int readInt() {
            int c = read();
            while (isSpaceChar(c))
                c = read();
            int sgn = 1;
            if (c == '-') {
                sgn = -1;
                c = read();
            }
            int res = 0;
            do {
                res *= 10;
                res += c - '0';
                c = read();
            } while (!isSpaceChar(c));
            return res * sgn;
        }

        public boolean isSpaceChar(int c) {
            return c == ' ' || c == '\n' || c == '\r' || c == '\t' || c == -1;
        }

    }
}

