Problem:
Score : 100 points

Problem Statement

There are two buttons, one of size A and one of size B.

When you press a button of size X, you get X coins and the size of that button decreases by 1.

You will press a button twice. Here, you can press the same button twice, or press both buttons once.

At most how many coins can you get?

Constraints

All values in input are integers.

3 \leq A, B \leq 20

Input

Input is given from Standard Input in the following format:

A B

Output

Print the maximum number of coins you can get.

Sample Input 1

5 3

Sample Output 1

9

You can get 5 + 4 = 9 coins by pressing the button of size 5 twice, and this is the maximum result.

Sample Input 2

3 4

Sample Output 2

7

Sample Input 3

6 6

Sample Output 3

12

Solution in Java8 (OpenJDK 1.8.0) (judge verdict: Accepted)

import java.util.Scanner;
public class Main{
    
    public static void main (String[ ]args){
        
        Main main = new Main ();
        main.solve();
    }
    
    private void solve (){
        Scanner sc = new Scanner (System.in);
        
        int A = sc.nextInt();
        int B = sc.nextInt();
        
        if (A==B){
            System.out.println(A+B);
        } else {
            if (A>B){
                System.out.println(A+A-1);
            } else {
                System.out.println(B+B-1);
            }
        }
    }
}