import java.util.Scanner;
public class Main {
    public static void main(String [] args){
        Scanner sc = new Scanner(System.in);
        int a, b, x;
        a = sc.nextInt();
        b = sc.nextInt();
        if(a>=3 && b<=20){
            if(a>b){
               int c = a-1;
               if(c>b){
                   System.out.println(a+c);
               }
               else{
                   System.out.println(a+b);
               }
            }
            else{
                int c = b-1;
                if(c>a){
                    System.out.println(b+c);
                }
                else{
                    System.out.println(a+b);
                }
            }
        }
    }
}
/tmp/hf-datasets-cache/medium/datasets/42704881117311-config-parquet-and-info-qiankunmu-Project_CodeNet-896c9d36/hub/datasets--qiankunmu--Project_CodeNet_Python800_and_Java250/snapshots/c899fde44a77ba1cc14973ed3de064e4ff3aadc7/Project_CodeNet_Java250.tar.gz