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 (1.14.1) (judge verdict: Accepted)

package main
 
import (
  "fmt"
)
 
func main() {
  var a, b int
  fmt.Scanf("%d %d", &a, &b)
  
  ans := 0
  if a == b {
    ans = a + b
  }
  if a > b {
    ans = a + (a - 1)
  }
  if a < b {
    ans = b + (b - 1)
  }
  
  fmt.Printf("%d\n", ans)
}