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 (GCC 5.4.1) (judge verdict: Accepted)

#include<stdio.h>
int main()
{
	int A, B,ans=0;
	scanf("%d %d", &A, &B);

	if (A -B>0)
	{
		ans= A*2 - 1;
	}
	else
	{
		if (A - B < 0)
		{
			ans = B * 2 - 1;
		}
	
		else
		{
			if (A = B)
			{
				ans = B * 2;
			}
			
		}
	}
	printf("%d", ans);
	
	return 0;
}