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 Main() {
		// TODO 自動生成されたコンストラクター・スタブ
	}
	
	public static void main(String[] args){
			Scanner sc = new Scanner(System.in);
			// 整数の入力
			int a;
			int b;
			int result;
			a = sc.nextInt();
			b = sc.nextInt();
			if (a>b) {
				if(a-1>b) {
					result=a+(a-1);
					}
				else{
					result=a+b;
					}
				}
			else {
				if(b-1>a) {
					result=b+(b-1);
					}
				else{
					result=a+b;
					}
			}
			// 出力

			System.out.println(result);
	}
}