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)

 int main(){
       int a=0,b=0;
     int i=0;
     int j=0;
       scanf("%d %d",&a,&b);
       for(j=0;j<2;j++){
       if(a>=b)
       {
        i=i+a;
       	a=a-1;
       }
       else
       {
       	i=i+b;
       	b=b-1;
       }
       }
       printf("%d\n",i);
       return 0;
   }