import java.util.Scanner;
public class Main{
    public static void main(String [] args){
        Scanner scan=new Scanner (System.in);
        int a=scan.nextInt();
        int b=scan.nextInt();
        int ans=0;
        if(a<b){
            ans+=b;
            b--;
        }else{
            ans+=a;
            a--;
        }
        if(a<b){
            ans+=b;
            b--;
        }else{
            ans+=a;
            a--;
        }
        System.out.println(ans);
        
    }
}
/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