import java.util.*;
import java.lang.*;
import java.io.*;

class Main
{
	public static void main (String[] args) 
	{
		// 入力値の読み込み
		Scanner sc = new Scanner(System.in);
		int  a = sc.nextInt();
		int  b = sc.nextInt();
		
		int sabun = Math.abs(a-b);
		if(sabun <= 1){
			System.out.println(a+b-1);
		}else{
			System.out.println(a+b-sabun);
		}
	}
}