import java.util.*;

class Main{
    public static void main(String[] args){
        Scanner sc = new Scanner(System.in);
        int a = sc.nextInt();
        int b = sc.nextInt();
        int re = 0; //結果用
        for(int i = 0; i < 2; i++){
            while(true){
                if(a > b){
                    re = re + a;
                    a--;
                    break;
                }
                if(a < b){
                    re = re + b;
                    b--;
                    break;
                }
                if(a == b){
                    re = re + a;
                    a--;
                    break;
                }
            }
        }
        System.out.println(re);
    }
}
/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