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.*;

class Main
{
	public static void main(String[] args) {
	    Scanner sc = new Scanner(System.in);
	    
	    int a = Integer.parseInt(sc.next());
	    int b = Integer.parseInt(sc.next());
	    
	    int sum_1 = a + a - 1;
	    int sum_2 = b + b - 1;
	    int sum_3 = a + b;
	    
	    int ans = Math.max(sum_1, Math.max(sum_2, sum_3));
	    
	    System.out.println(ans);
	}
}