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 Scala (2.11.7) (judge verdict: Runtime Error)

import scala.io.StdIn

object Main extends {
  val input = StdIn.readLine().split(" ").map(_.toInt)
  var a = input(0)
  var b = input(1)
  var ret = 0
  ret = exec
  ret += exec
  println(ret)

  def exec() = {
    var ret = 0
    if (a > b) {
      ret = a
      a -= 1
    } else {
      ret = b
      b -= 1
    }
    ret
  }
}