import java.util.Scanner;
public class Main {
	public static void main(String[]args) {
		Scanner teclado = new Scanner (System.in);
		int A;
		int B;
		A=teclado.nextInt();
		B=teclado.nextInt();
		
		
		if(((A*2)-1) > A+B &&  (((A*2)-1)) > ((B*2)-1) ){
			System.out.println((A*2)-1);
		}else if(((B*2)-1) > A+B && ((B*2)-1) >((A*2)-1) ) {
			System.out.println((B*2)-1);			
		}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