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 JavaScript (node.js v5.12) (judge verdict: Accepted)

function Main(input) {
    // 1行目がinput[0], 2行目がinput[1], …に入る
    A = Number(input.split(" ")[0]);
    B = Number(input.split(" ")[1]);
    answer = 0;

    if(A >= B){
        answer += A;
        A =A -1;
    }else{
        answer += B;
        B =B -1;
    }

    if(A >= B){
        answer += A;
        A =A -1;
    }else{
        answer += B;
        B =B -1;
    }


    
    console.log(answer);
}
    


//*この行以降は編集しないでください（標準入出力から一度に読み込み、Mainを呼び出します）
Main(require("fs").readFileSync("/dev/stdin", "utf8"));