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(void) {

   int A,B;
   
   scanf("%d%d",&A,&B);
   
   int i,ans;
   
   ans = 0;
   for(i = 0;i < 2;i++){
      if(A > B) {
         ans = ans + A;
         A = A - 1;
      }
      else {
         ans = ans + B;
         B = B - 1;
      }
   }

   printf("%d\n",ans);
   
  return 0;
}