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) {
		int A = 0;
		int B = 0;
		Scanner sc = new Scanner(System.in);
		A = Integer.parseInt(sc.next());
		B = Integer.parseInt(sc.next());
		int max = 0;
		int i;
		for (i = 0; i < 2; i++) {
			if (A > B) {
				max += A;
				A--;
			} else {
				max += B;
				B--;
			}
		}
		System.out.println(max);
	}
}