import java.util.*;
public class Main {
	public static void main(String[] args){
		Scanner sc = new Scanner(System.in);
      int A = sc.nextInt();
      int B = sc.nextInt();
      int C = A + B;
      int D = A + (A-1);
      int E = B + (B-1);
      if(C>=D && C>=E){
        System.out.println(C);
      }else if(D>=C && D>=E){
        System.out.println(D);
      }else if(E>=C && E>=D){
        System.out.println(E);
      }
    }
}
/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