import java.util.Scanner;

public class Main {
	@SuppressWarnings("resource")
	public static void main(String[] args) {
		Scanner imput =  new Scanner(System.in);
		int  A,B;
		A=imput.nextInt();
		B=imput.nextInt();
		int max=A+B;
		if(2*A-1>max)
			max=2*A-1;
		else if(2*B-1>max)
			max=2*B-1;
		System.out.println(max);
	}
}
/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