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 Java (OpenJDK 11.0.6) (judge verdict: Runtime Error)

import java.util.Scanner;
public class Main{
  	public static void main (String [] args){
      	Scanner scanner = new Scanner (System.in);
      	int N = scanner.nextInt();
      	int [] arr = new int [N];
      	for (int i = 0; i < N; i++){
          	arr[i] = scanner.nextInt();
        }
      	int counter = 0;
      	for (int i = 1; i < N; i++){
          	if (arr[i-1] <= arr[i]) counter++;
          	else break;
        }
      	System.out.println(counter);
    }
}