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: Wrong Answer)

#include<stdio.h>

int main(){
	int A,B,anser1,anser2,anser;
	char ch1,ch2;

	printf("Aの値を入力\n");
	scanf("%d",&A);
	printf("Bの値を入力\n");
	scanf("%d",&B);

	puts("ボタンを押してください");
	getchar();
	ch1=getchar();

	if(ch1=='A'){
		anser1=A;
	}
	else if(ch1=='B'){
		anser1=B;
	}

	puts("ボタンをもう一度押してください");
	getchar();
	ch2=getchar();
	if(ch2=='A'){
		anser2=A;
	}
	else if(ch2=='B'){
		anser2=B;
	}
	if(ch1==ch2){
		anser=anser1+(anser2-1);
	}
	else{
	anser=anser1+anser2;
}
	printf("答えは%d\n",anser);


	return 0;
}