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 Go (1.6) (judge verdict: Accepted)

package main

import (
	"fmt"
	"log"
	"math"
)

func main() {

	var A, B int //
	var result int

		_, err := fmt.Scan(&A, &B)
		if err != nil {
			log.Fatal(err)
		}

		if A == B{
			result = A + B
		}else{
			result = int(math.Max(float64(A),float64(B))) * 2 - 1
		}

		fmt.Println(result)
}