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 C (Clang 10.0.0) (judge verdict: Accepted)

#include<stdio.h>
int main()
{
    int a,b,x,y;
    scanf("%d%d",&a,&b);
    if(a>=b)
    {
        x=a;
        a=a-1;
        if(a>=b)
        {
            y=a;
        }
        else
        {
            y=b;
        }
    }
    else
    {
        x=b;
        b=b-1;
        if(b>=a)
        {
            y=b;
        }
        else
        {
            y=a;
        }
    }

    printf("%d",x+y);
    return 0;
}