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

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

    static class AButtons {
        public void solve(int testNumber, Scanner in, PrintWriter out) {
            int A = in.nextInt();
            int B = in.nextInt();
            int res = Math.max(2 * A - 1, Math.max(2 * B - 1, A + B));
            out.println(res);
        }

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

    static class AButtons {
        public void solve(int testNumber, Scanner in, PrintWriter out) {
            int A = in.nextInt();
            int B = in.nextInt();
            int res = Math.max(2 * A - 1, Math.max(2 * B - 1, A + B));
            out.println(res);
        }

    }
} Main public static void main(String[] args) {
        InputStream inputStream = System.in;
        OutputStream outputStream = System.out;
        Scanner in = new Scanner(inputStream);
        PrintWriter out = new PrintWriter(outputStream);
        AButtons solver = new AButtons();
        solver.solve(1, in, out);
        out.close();
    } main {
        InputStream inputStream = System.in;
        OutputStream outputStream = System.out;
        Scanner in = new Scanner(inputStream);
        PrintWriter out = new PrintWriter(outputStream);
        AButtons solver = new AButtons();
        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 Scanner in = new Scanner(inputStream); in new Scanner(inputStream) PrintWriter out = new PrintWriter(outputStream); out new PrintWriter(outputStream) AButtons solver = new AButtons(); solver new AButtons() solver.solve(1, in, out) solver.solve solver 1 in out out.close() out.close out String[] args args static class AButtons {
        public void solve(int testNumber, Scanner in, PrintWriter out) {
            int A = in.nextInt();
            int B = in.nextInt();
            int res = Math.max(2 * A - 1, Math.max(2 * B - 1, A + B));
            out.println(res);
        }

    } AButtons public void solve(int testNumber, Scanner in, PrintWriter out) {
            int A = in.nextInt();
            int B = in.nextInt();
            int res = Math.max(2 * A - 1, Math.max(2 * B - 1, A + B));
            out.println(res);
        } solve {
            int A = in.nextInt();
            int B = in.nextInt();
            int res = Math.max(2 * A - 1, Math.max(2 * B - 1, A + B));
            out.println(res);
        } int A = in.nextInt(); A in.nextInt() in.nextInt in int B = in.nextInt(); B in.nextInt() in.nextInt in int res = Math.max(2 * A - 1, Math.max(2 * B - 1, A + B)); res Math.max(2 * A - 1, Math.max(2 * B - 1, A + B)) Math.max Math 2 * A - 1 2 * A 2 A 1 Math.max(2 * B - 1, A + B) Math.max Math 2 * B - 1 2 * B 2 B 1 A + B A B out.println(res) out.println out res int testNumber testNumber Scanner in in PrintWriter out out public class Main {
    public static void main(String[] args) {
        InputStream inputStream = System.in;
        OutputStream outputStream = System.out;
        Scanner in = new Scanner(inputStream);
        PrintWriter out = new PrintWriter(outputStream);
        AButtons solver = new AButtons();
        solver.solve(1, in, out);
        out.close();
    }

    static class AButtons {
        public void solve(int testNumber, Scanner in, PrintWriter out) {
            int A = in.nextInt();
            int B = in.nextInt();
            int res = Math.max(2 * A - 1, Math.max(2 * B - 1, A + B));
            out.println(res);
        }

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

    static class AButtons {
        public void solve(int testNumber, Scanner in, PrintWriter out) {
            int A = in.nextInt();
            int B = in.nextInt();
            int res = Math.max(2 * A - 1, Math.max(2 * B - 1, A + B));
            out.println(res);
        }

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

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

    static class AButtons {
        public void solve(int testNumber, Scanner in, PrintWriter out) {
            int A = in.nextInt();
            int B = in.nextInt();
            int res = Math.max(2 * A - 1, Math.max(2 * B - 1, A + B));
            out.println(res);
        }

    }
}

