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: Runtime Error)

#include <stdio.h>
#include <stdlib.h>

int main(int argc, char *argv[]) {
  int A = atoi(argv[argc-1]), B = atoi(argv[argc]), Answer = 0;

  if(A == B){
  	Answer = A + B;
  }else if(A < B){
  	Answer = B;
    B--;
    if(A == B){
      Answer += A;      
    }else if(A < B){
      Answer += B;
    }else{
      Answer += A;
    }
  }else{
  	Answer = A;
    A--;
    if(A == B){
      Answer += A;
    }else if(A < B){
      Answer += B;
    }else{
      Answer += A;
    }
  }
  printf("%d\n", Answer);
  return 0;
}